United States v. CITGO Petroleum Corporation ( 2015 )


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  •      Case: 14-40128   Document: 00513186668    Page: 1   Date Filed: 09/09/2015
    REVISED September 9, 2015
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE FIFTH CIRCUIT
    United States Court of Appeals
    Fifth Circuit
    FILED
    No. 14-40128                   September 4, 2015
    Lyle W. Cayce
    UNITED STATES OF AMERICA,                                             Clerk
    Plaintiff - Appellee
    v.
    CITGO PETROLEUM CORPORATION; CITGO REFINING AND
    CHEMICALS COMPANY, L.P.,
    Defendants - Appellants
    Appeal from the United States District Court
    for the Southern District of Texas
    Before DAVIS, JONES, and CLEMENT, Circuit Judges.
    EDITH H. JONES, Circuit Judge:
    CITGO Petroleum Corporation and CITGO Refining and Chemicals
    Company, L.P. (collectively “CITGO”) were convicted of multiple violations of
    the Clean Air Act, 42 U.S.C. § 7413 and 40 C.F.R. § 60.690 et seq. (“Subpart
    QQQ”), and the Migratory Bird Treaty Act of 1918 (“MBTA”), 16 U.S.C. § 703.
    CITGO urges this court to reverse the Clean Air Act convictions because the
    district court erroneously instructed the jury about the scope of a regulation
    concerning “oil-water separators.”   CITGO also contends that the MBTA
    convictions are infirm because the district court misinterpreted the century-
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    old statute as covering unintentional bird kills. We essentially agree with both
    contentions and REVERSE.
    BACKGROUND
    In the 1980s, the Environmental Protection Agency (“EPA”) exercised its
    authority under Section 111 of the Clean Air Act, 42 U.S.C. § 7411, to regulate
    oil refinery wastewater treatment systems. 1               These systems, the EPA
    explained, emit dangerous levels of volatile organic compounds (“VOCs”), such
    as xylene, toluene, and benzene. Standards of Performance for New Stationary
    Sources; VOC Emissions From Petroleum Wastewater Systems [hereinafter
    “Proposed Standards”], 52 Fed. Reg. 16,334-01, 16,337 (May 4, 1987) (to be
    codified at 40 C.F.R. pt. 60). When VOCs enter the atmosphere they cause
    photochemical reactions that produce ozone. 
    Id. Ozone, a
    principal ingredient
    of urban smog, can trigger a variety of respiratory problems. To mitigate the
    alleged health risks, the EPA sought to reduce the VOCs entering the
    wastewater system, reduce the surface area of wastewater exposed to the
    atmosphere, and control the venting of VOCs to the extent practicable. 
    Id. at 16,337.
          Understanding the ensuing regulations, however, requires a brief
    overview of the wastewater treatment process. Wastewater—containing a
    mixture of solids, sludges, and oil—is an inevitable byproduct of the refining
    process.    U.S. ENVTL. PROT. AGENCY, VOC EMISSIONS FROM PETROLEUM
    REFINERY WASTEWATER SYSTEMS—BACKGROUND INFORMATION FOR PROPOSED
    STANDARDS [hereinafter “Background for Proposed Standards”], EPA-450/3-
    85-001a, at 3-3 (1985). A series of drains located in different parts of the
    refinery collects the wastewater as it is generated. 
    Id. From there,
    the water
    1  The EPA also regulates these systems under the Clean Water Act, U.S. ex rel. Adm’r
    of EPA. v. CITGO Petroleum Corp., 
    723 F.3d 547
    , 549 (5th Cir. 2013), but the government
    did not charge CITGO with any CWA violations here.
    2
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    travels through lateral sewers into the first piece of oil separation equipment,
    aptly called an oil-water separator.        
    Id. When wastewater
    enters the
    separator, oils and solids with specific gravities less than that of water float to
    the top, while heavy sludges and solids sink to the bottom. 
    Id. Skimmers then
    remove the top layer of floating oil for recycling. 
    Id. Although these
    separators
    are the primary oil removal equipment, they are not designed to remove all the
    oil from wastewater; according to the EPA, oil-water separators can remove
    between fifty and ninety-nine percent of separable oil. 
    Id. at 3-56.
    When the
    EPA promulgated the regulation at issue in 1987, there were three types of oil-
    water separators: the American Petroleum Institute (“API”), Corrugated Plate
    Interceptor (“CPI”), and Parallel Plate Interceptor (“PPI”). 
    Id. at 3-28.
    The
    EPA considered CPIs, the type of separators used at CITGO’s facility,
    “enhanced oil-water separators” because they are more efficient than the then-
    prevalent API separators. 
    Id. After wastewater
    passes through the oil-water separator it pools in large
    vessels called equalization tanks. By providing a way point between the oil-
    water separators and subsequent treatments, the tanks ensure that a constant
    and manageable amount of wastewater flows to secondary treatment systems.
    Background for Proposed 
    Standards, supra, at 3-54
    .           In other words, the
    equalization tanks increase the efficiency of downstream treatment processes
    by preventing large unpredictable discharges (which are common in refineries)
    from overwhelming those systems. 
    Id. When oil
    accumulates in the tanks,
    skimmers and vacuum trucks extract the excess oil for recycling.
    Next, wastewater undergoes air flotation. Gas and air are pumped into
    the wastewater. Background for Proposed 
    Standards, supra, at 3-41
    . The
    gases then form bubbles that attach to suspended oil. 
    Id. The combined
    oil-
    gas bubbles, with densities less than water, float to the top. 
    Id. The resulting
    layer of oil can then be skimmed off and recycled.          
    Id. From there,
    the
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    wastewater undergoes biological treatment in an aerobic basin, then passes
    through a clarifier before finally being released. 
    Id. at 3-53.
           CITGO’s Corpus Christi refinery fits this general description. Drains
    collect wastewater and transport it to two CPI oil-water separators.                     On
    average, the CPIs removed about 70 percent of separable oil. The water flowed
    from the separators into two large equalization tanks, referred to as Tanks 116
    and 117, each measuring thirty-feet tall and 240 feet in diameter. When
    unpredictable discharges occurred, oil pooled in the equalization tanks, and
    CITGO used vacuum trucks and skimmers to remove the excess oil. Although
    the CPI oil-water separators had roofs, at the time of the alleged violations,
    Tanks 116 and 117 did not.
    After a surprise inspection in March 2002 revealed 130,000 barrels of oil
    floating atop the uncovered equalization tanks, Texas environmental
    inspectors cited CITGO for violating the Clean Air Act. 2 Under Subpart QQQ,
    which resulted from the EPA’s push to limit VOC emissions from oil refineries,
    all oil-water separators must have roofs.            Because the equalization tanks
    contained such a large amount of oil, Texas authorities concluded CITGO was
    using Tanks 116 and 117 as oil-water separators. And because those tanks
    were uncovered, authorities concluded that CITGO was violating Subpart
    QQQ.
    In 2007, a grand jury returned a ten-count indictment. As relevant here,
    the indictment accused CITGO in two counts of knowingly operating Tanks
    2 When Congress passed the Clean Air Act, it recognized that “air pollution prevention
    (that is, the reduction or elimination, through any measures, of the amount of pollutants
    produced or created at the source) and air pollution control at its source is the primary
    responsibility of States and local governments.” 42 U.S.C. § 7401(a)(3). Accordingly, the
    Clean Air Act places primary enforcement responsibility on the states. See 
    id. § 7411(c).
    The
    federal government, however, retains secondary enforcement authority. The federal
    government, instead of Texas, exercising its secondary authority, prosecuted this case.
    4
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    116 and 117 as oil-water separators without emission control devices in
    violation of 42 U.S.C. § 7413(c)(1), and 40 C.F.R. § 60.692-4. 3 
    Id. Because the
    government suspected birds had died in the uncovered tanks, the indictment
    also accused CITGO of “taking” migratory birds in violation of the MBTA, 16
    U.S.C. § 703. 4    
    Id. The trial
    occurred in two parts.         In the first, a jury
    exonerated the defendants on three CAA counts but found CITGO guilty on
    the two above-noted counts. CITGO moved to set aside the verdict, arguing,
    inter alia, that the district court’s jury instruction misinterpreted Subpart
    QQQ. The district court denied the motion. See United States v. CITGO
    Petroleum Corp. (Clean Air Act Opinion), No. C-06-563, 
    2011 WL 1155684
    , at
    *1 (S.D. Tex. March 28, 2011). In the nonjury phase of the trial, the district
    court found CITGO guilty of three (out of five) counts for “taking” migratory
    birds. The district court denied CITGO’s motion to vacate these convictions.
    United States v. CITGO Petroleum Corp. (MBTA Opinion), 
    893 F. Supp. 2d 841
    (S.D. Tex. 2012). The court sentenced CITGO to a $2 million fine for the Clean
    Air Act counts and $15,000 for each MBTA violation. CITGO now appeals.
    DISCUSSION
    CITGO presents three challenges to its convictions, only two of which
    need discussion. First, CITGO challenges the jury instruction that an oil-water
    separator is any equipment used to separate oil from water. Second, CITGO
    3   In addition to the Clean Air Act and MBTA counts, counts one and two charged
    CITGO with emitting benzene in excess of the allowed amount under Section 112 of the Clean
    Air Act. Count three alleged that CITGO and its Environmental Manager made false
    statements to authorities. 
    Id. The jury
    found CITGO not guilty on counts one and two. The
    district court dismissed count three as time-barred.
    4 Among the bird remains were five White Pelicans, twenty (regular old) Ducks, two
    Northern Shoveler Ducks, four Double Crested Cormorants, one Lesser Scaup Duck, one
    Black-Bellied Whistling Tree Duck, one Blue-Winged Teal Duck, and one Fulvous Whistling
    Tree Duck.
    5
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    argues that the MBTA only criminalizes acts related to hunting or poaching,
    not omissions that unintentionally kill birds. 5
    I.
    CITGO’s challenge to the jury instructions rests on one question: under
    Subpart QQQ, can an equalization tank be an oil-water separator? The district
    court thought it could. The jury instructions quoted Subpart QQQ’s definition
    of an oil-water separator and then added: “[t]he definition of oil-water
    separator does not require that [it] have any or all of the ancillary equipment
    mentioned such as forebays, weirs, grit chambers, and sludge hoppers . . . . An
    oil-water separator is defined by how it is used.” Clean Air Act Opinion,
    
    2011 WL 1155684
    , at *3. This purely functional explanation is not what
    Subpart QQQ says, however: it defines an oil-water separator by how it is used
    and by its constituent parts.        Nor does the district court’s interpretation
    comport with other regulations governing wastewater treatment systems or
    Subpart QQQ’s promulgation history. Although the jury was also provided the
    exact text of Subpart QQQ, the court’s instruction told them what it means and
    thus undoubtedly affected the verdict. For this harmful error, the Clean Air
    Act convictions must be reversed.
    The district court has “substantial latitude . . . in describing the law to
    the jury.” United States v. Williams, 
    610 F.3d 271
    , 285 (5th Cir. 2010). This
    court only evaluates “whether the charge, as a whole, was a correct statement
    of the law and whether it clearly instructed the jurors as to the principles of
    the law applicable to the factual issues confronting them.” United States v.
    Orji-Nowsu, 
    549 F.3d 1005
    , 1008 (5th Cir. 2008). In other words, this court
    5  The third issue is whether this prosecution violated CITGO’s due process rights
    because the EPA changed its interpretation of Subpart QQQ without notice. Because we hold
    that Subpart QQQ does not govern Tanks 116 and 117, we need not address CITGO’s
    constitutional argument.
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    reviews jury instructions for abuse of discretion. United States v. Santos,
    
    589 F.3d 759
    , 764 (5th Cir. 2009).       The legal conclusions underlying jury
    instructions, however, are reviewed de novo. See 
    Williams, 610 F.3d at 285
    .
    A.
    This court applies the same interpretive framework to regulations as to
    statutes.   KCMC, Inc. v. F.C.C., 
    600 F.2d 546
    , 549 (5th Cir. 1979).          The
    discussion begins, as it always must, with Subpart QQQ’s text.           Further,
    where, as here, a regulatory violation carries criminal penalties, the regulation
    “must be strictly construed and cannot be enlarged by analogy or expanded
    beyond the plain meaning of the words used.” United States v. Clark, 
    412 F.2d 885
    , 890 (5th Cir. 1969); accord United States v. Anzalone, 
    766 F.2d 676
    , 680
    (5th Cir. 1985); Diamond Roofing Co., Inc. v. OSHRC, 
    528 F.2d 645
    , 649 (5th
    Cir. 1976) (“If a violation of a regulation subjects private parties to criminal or
    civil sanctions, a regulation cannot be construed to mean what an agency
    intended but did not adequately express”).
    An oil-water separator, the regulation explains, is wastewater treatment
    equipment:
    used to separate oil from water consisting of a separation tank,
    which also includes the forebay and other separator basins,
    skimmers, weirs, grit chambers, and sludge hoppers. Slop oil
    facilities, including tanks, are included in this term along with
    storage vessels and auxiliary equipment located between
    individual drain systems and the oil-water separator. This term
    does not include storage vessels or auxiliary equipment which do
    not come in contact with or store oily wastewater.
    40 C.F.R. § 60.691. The parties concentrate their arguments on the first
    sentence of this paragraph. The government advances several arguments why
    this sentence invokes a quintessentially functional approach to defining an oil-
    water separator. As the district court put it, “an oil-water separator is defined
    by how it is used.” The government contends that because the first sentence
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    of this definition does not require a regulated piece of equipment to include the
    various devices listed in the latter half of the sentence, and because the
    government proved that CITGO “used” Tanks 116 and 117 “primarily” to
    separate oil from water, the violations and convictions must be sustained.
    To examine the government’s position, it is helpful to look at a diagram
    of a CPI oil-water separator that EPA included in its Background discussion
    before Subpart QQQ was promulgated and was admitted into evidence.
    Notably, the definition in Subpart QQQ exactly describes this diagram. All of
    the components listed in Subpart QQQ (separation tank, forebay, other
    separation basin, skimmers, weirs, grit chamber, and sludge hopper) are
    identifiable on the diagram, and they are components of the separators as
    described by EPA. See Background for Proposed 
    Standards, supra, at 3-30
    .
    On its face, then, the regulation clearly encompasses CPI oil-water
    separators of the sort that were upstream from CITGO’s equalization tanks
    and air flotation device at its Corpus Christi refinery. The question is whether
    this language covers more than CPI and similar oil-water separators. The first
    sentence sets out two requirements. Obviously, the equipment covered by
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    Subpart QQQ must be “used to separate oil from water.” Second and more
    critically, the equipment “consist[s] of” certain parts—that is, an oil-water
    separator is “composed or made up of” particular things. See WEBSTER’S THIRD
    NEW INTERNATIONAL DICTIONARY OF THE ENGLISH LANGUAGE 484 (1981). In
    addition to the separator’s function, the second element of the sentence
    explains that an oil-water separator is made up of (or composed of) “a
    separation tank, . . . skimmers, weirs, grit chambers, and sludge hoppers.
    When used in this way, “consists” introduces an exhaustive list; the listed
    components are part of the definition of the oil-water separator. See ANTONIN
    SCALIA & BRYAN A. GARNER, READING LAW: THE INTERPRETATION OF LEGAL
    TEXTS 132-33 (2012); BRYAN A. GARNER, GARNER’S MODERN AMERICAN USAGE
    440 (2003). Although Tanks 116 and 117 had skimmers, it is undisputed that
    they did not have weirs, grit chambers, or sludge hoppers. Therefore, they are
    not oil-water separators under Subpart QQQ, and CITGO cannot be guilty of
    violating Subpart QQQ. 6
    The EPA, nevertheless, urges us to reject this straightforward reading.
    In the EPA’s view, Subpart QQQ’s list of parts is governed, not by the phrase
    “consisting of,” but by “includes.” “Includes,” in the words of the district court,
    is “inclusive, but not mandatory” and distinct from “consisting of.” Clean Air
    Act Opinion, 
    2011 WL 1155684
    , at *4. Accordingly, the phrase “which also
    includes” and the list of parts that follows explain “whether or not ancillary
    equipment is included in the term [oil-water separator] for purposes of the
    regulation.”    
    Id. The phrase
    does not mean that the listed equipment is
    6Although it may be possible to conclude that equipment lacking some listed parts is
    what an oil-water separator “consists” of, the canon of constitutional avoidance precludes this
    interpretation. Under this rule, courts must “avoid an interpretation of a [regulation] that
    engenders constitutional issues if a reasonable alternative interpretation poses no
    constitutional question.” Gomez v. United States, 
    490 U.S. 858
    , 864, 
    109 S. Ct. 2237
    , 2241
    (1989).
    9
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    necessary for the regulation to be invoked. 
    Id. The district
    court reasoned that
    CITGO’s interpretation would render “includes” superfluous and would
    redefine the regulation to state something like, “‘Oil-water separator’ means
    wastewater treatment equipment used to separate oil from water consisting of
    a separation tank, the forebay and other separator basins, skimmers, weirs,
    grit chambers, and sludge hoppers.” 
    Id. Although we
    agree that “includes” is inclusive, we disagree that
    “includes” governs and renders merely descriptive, not prescriptive, Subpart
    QQQ’s list. Instead, “includes” governs the relative clause beginning with
    “which” and extending to “other separator basins.” To see why requires a close
    parsing of the sentence. The relative pronoun “which” refers to the noun
    immediately preceding it—“separation tank.” See THE CHICAGO MANUAL OF
    STYLE § 5.57 (16th ed. 2010) (explaining that generally a relative pronoun’s
    antecedent immediately precedes it). Read together, the phrase “which also
    includes” expands the description of a separation tank to include the other
    tanks, or basins, where the entirety of the CPI separation process occurs. As
    the above diagram shows, a CPI oil-water separator has three such places—
    the forebay, the separation tank, and the outlet basin. Because all of these
    share the characteristic of being a tank or basin, it is grammatically accurate
    for the relative clause to expand the definition of “separation tank.”
    Accordingly, the most logical reading of the relative clause is that it expands
    the definition of a separation tank to include all the spaces where separation
    can occur. 7
    7 In fact, when the EPA promulgated the final version of Subpart QQQ, it placed the
    relative clause in parentheses in the preamble. See Standards of Performance for New
    Stationary Sources; VOC Emissions from Petroleum Refinery Wastewater Systems
    [hereinafter “Final Standards”], 53 Fed. Reg. 47,616-01, 47,616 (Nov. 23, 1988) (to be codified
    at 40 C.F.R. pt 60) (“Oil-water separators include the separation tank (which also includes
    the forebay and other separation basins), skimmers, weirs, grit chambers, and sludge
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    B.
    This reading harmonizes Subpart QQQ’s definition with its substantive
    requirements. The regulation requires refineries to cover oil-water separators.
    A CPI oil-water separator is configured such that it is possible to cover one
    basin or tank without covering the other two. In fact, during the notice and
    comment period, one commenter suggested that only the forebay, where most
    oil recovery takes place, should have a roof. U.S. ENVTL. PROT. AGENCY, VOC
    EMISSIONS       FROM      PETROLEUM         REFINERY       WASTEWATER         SYSTEMS—
    BACKGROUND INFORMATION FOR PROMULGATED STANDARDS [hereinafter
    “Background for Promulgated Standards”], EPA-450/3-85-001b, at 2-30 (1987).
    Subpart QQQ, as we interpret it, requires refineries to cover the separation
    tank, the forebay, and other separation basins that are present. None of the
    language of Subpart QQQ is superfluous, and the limitations intended by EPA,
    according to its published commentary during the rulemaking process, are
    embodied in this language.
    At the same time, it would be nonsensical to assert, as the government
    does, that Subpart QQQ explains that all listed parts, if present, must be
    covered. The above diagram is again instructive. Many of the parts listed in
    Subpart QQQ either cannot be covered individually (weirs, skimmers) or are
    wholly contained within the separation chamber, forebay, or outlet basin. Only
    three general areas of an oil-water separator can be covered, and the clause
    “which also includes the forebay and other separator basins” identifies those
    three areas. The rest of the parts listed are what an oil-water separator
    “consists of” and, therefore, are required for equipment to fall within the
    definition.
    hoppers.”). Although not dispositive, this certainly supports reading the relative clause to
    end after “other separation basins.”
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    EPA’s additional arguments for a purely functional interpretation of this
    regulation can be briefly disposed of. We disagree with EPA’s contention that
    the second and third sentences of the regulation enhance a purely functional
    definition. The second sentence refers only to slop oil facilities and tanks
    located between individual drain systems (which are upstream) and the oil-
    water separator; Tanks 116 and 117 are not slop oil tanks under the regulatory
    definition and they are downstream of the CPI separators. EPA’s “process”
    argument, that this regulation covers the entire process of oil-water
    separation, is contradicted by two facts.        First, EPA routinely described
    equalization tanks, which sit downstream of the CPI separators, as a part of
    the air flotation system, and it excluded both from the final regulation in this
    subpart.   Background for Promulgated 
    Standards, supra, at 1-1
    .            Second,
    because nearly every piece of equipment in a refinery’s wastewater treatment
    system is used to separate oil from water (e.g. flocculation tanks, filtration
    tanks, clarifiers), the process argument proves too much: EPA could have
    written a much simpler regulation if it planned to require covers over the
    entire system rather than with definitional precision.
    The government’s functional, purportedly all-inclusive interpretation is
    also flawed because it conflicts with Subpart Kb, which regulates storage
    vessels excluded from Subpart QQQ. 40 C.F.R. § 60.692-3(d). Regulations,
    like statutes, must be “construed so that effect is given to all [their] provisions,
    so that no part will be inoperative or superfluous, void or insignificant.” Corley
    v. United States, 
    556 U.S. 303
    , 314, 
    129 S. Ct. 1558
    , 1566 (2009). Subpart Kb
    specifically governs storage vessels used in the wastewater treatment system.
    40. C.F.R. § 60.110b(a). And like Subpart QQQ, it requires equipment emitting
    large amounts of VOCs to have roofs. 
    Id. § 60.112b(a).
    But unlike Subpart
    QQQ, Subpart Kb requires the storage vessels to be covered only if they have
    a vapor pressure above certain threshold amounts. 
    Id. The district
    court’s
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    interpretation of Subpart QQQ, however, effectively eliminates Subpart Kb’s
    vapor pressure trigger. In its view, essentially all vessels that are part of the
    treatment system must be covered, no matter their vapor pressure. Yet all
    such vessels are in some sense used to separate oil from water. If their “use,”
    or even “primary use” in oil-water separation is enough to trigger Subpart
    QQQ’s requirement, this interpretation renders Subpart Kb’s vapor pressure
    triggers inoperative. Basic rules of interpretation require avoiding this result.
    The interpretation of Subpart QQQ adopted here gives effect to both
    Subpart QQQ and Subpart Kb. For Subpart QQQ to govern a vessel it must
    have the parts listed in the definition of an oil-water separator—a separation
    chamber or chambers, skimmers, weirs, grit chambers, and sludge hoppers. In
    practical terms, Subpart Kb governs equalization tanks, like Tanks 116 and
    117, which (except for skimmers) do not have those parts, while Subpart QQQ
    governs oil-water separators, like the Corpus Christi refineries’ two CPI oil-
    water separators.
    The government has not responded to this holistic harmonization of its
    own regulations. Indeed, until now, the government read Subpart QQQ and
    Subpart Kb exactly the same way. In response to an inquiry from a refinery
    operator, the EPA announced that “since [equalization] tanks are subject to . .
    . Subpart Kb . . ., they are not regulated by Subpart QQQ.” U.S. Envtl. Prot.
    Agency Applicability Determination Index, Control No. 0100058, Letter from
    R. Douglas Neeley, Chief, Air & Radiation Tech. Branch, Air, Pesticides, &
    Toxics Mgmt. Div., to Timothy S. Owen, Chief, Eng’g Servs. Branch, Air Div.,
    Alabama Dep’t of Envtl. Mgmt., Aug. 17, 2001. Even more confounding to its
    present contentions, the EPA explained that “the Subpart QQQ definition of
    an ‘oil-water separator’ . . . [is] associated with API separators or enhanced
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    separators such as CPI separators.” 
    Id. In other
    words, Subpart QQQ governs
    CPI and API (and presumably PPI) separators, not equalization tanks. 8
    C.
    Ordinarily, when a regulation is clear and unambiguous—as Subpart
    QQQ is—there is no reason to discuss its promulgation history. See United
    States v. Gonzales, 
    520 U.S. 1
    , 6, 
    117 S. Ct. 1032
    , 1035 (1997). The parties,
    however, spent considerable time analyzing the history, which to the extent
    relevant, further supports our conclusion that equalization tanks are not oil-
    water separators and that Subpart QQQ only covers the latter.
    Subpart QQQ, as originally proposed, was much broader than the
    enacted version.     At that time, EPA explained that “refinery wastewater
    systems are highly interrelated sources of VOC emissions.”                     Proposed
    Standards, 52 Fed. Reg. at 16,335. As a result, EPA concluded, emission
    controls on the entire wastewater system are “environmentally prudent” and
    “within the range of range of reasonable costs.”            
    Id. Thus, the
    proposed
    Subpart QQQ regulated “all the emission points . . . that are functionally
    related; that is, each individual drain system together with its ancillary
    downstream      treatment     components       (including   sewer     lines,   oil-water
    separators and air flotation systems).” 
    Id. In essence,
    proposed Subpart QQQ
    governed what the EPA wishes it governed now—every part of the wastewater
    treatment system “from which VOC vapors might be emitted.” 
    Id. Several refinery
    operators, including CITGO, commented on the
    proposed regulation. See Background for Promulgated 
    Standards, supra, at 1
    -
    1, 1-2. As previously mentioned, one commenter suggested that the regulation
    8 The EPA is not the only government agency to take this position. In 1999, three
    years before the 2002 inspection, Texas environmental inspectors first cited CITGO for
    operating Tanks 116 and 117 as oil-water separators. During the ensuing investigation,
    Texas officials concluded that CITGO’s position—that Tanks 116 and 117 are not oil-water
    separators under Subpart QQQ—was correct. Accordingly, Texas dropped all the charges.
    14
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    No. 14-40128
    only require a roof over the oil-water separator’s forebay. Id at 2-30. Many
    commenters objected to the requirement that air flotation systems have roofs
    because they are not cost effective, they increase the risk of explosions and fire,
    and impair the efficiency of the wastewater treatment system. Id at 2-7.
    Another commenter complained about Subpart QQQ’s applicability to
    equalization tanks, like Tanks 116 and 117. 
    Id. at 2-8.
    According to the
    commenter, covering these tanks is difficult and presents the same safety
    concerns as covering the air flotation system itself. 
    Id. In response,
    the EPA undertook a thorough reevaluation of Subpart
    QQQ and made substantial changes. The final version was drafted to exclude
    air flotation systems.    The “safety concerns raised by commenters,” the
    government explained, “cannot be overcome in a cost effective manner.”
    Background for Promulgated 
    Standards, supra, at 1
    -2. And, under the best
    case scenario, covering the air flotation system would result only in a
    “negligible” reduction in VOC emissions. 
    Id. “[F]or the
    same reasons” the final
    regulation excluded “equalization basins and other auxiliary tanks, basins,
    and equipment between the oil- water separator and air flotation system.” 
    Id. As with
    air flotation systems, “there are no cost-effective methods of VOC
    emissions destruction or removal that have been demonstrated for these
    facilities.   Further, suppression of VOC emissions at these points in the
    treatment process merely suppresses temporarily the VOC’s downstream to be
    emitted at other uncontrolled locations.” 
    Id. This history
    points to the same conclusions as Subpart QQQ’s text:
    Subpart QQQ governs oil-water separators but not equalization tanks. In
    numerous places, the government unequivocally stated exactly that. At no
    point did the government warn that any equipment, if used to separate oil from
    water, would be regulated. And if it had, such statement would conflict with
    the regulation’s text. Further, under the government’s reading, Subpart QQQ
    15
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    No. 14-40128
    also governs systems the EPA explicitly exempted, like air flotation systems.
    Those systems are “commonly used in refinery wastewater treatment systems
    to remove free oil . . . [and] emulsified oil.”     Background for Proposed
    
    Standards, supra
    , 3-41. Yet “the final standards [were] revised to exempt air
    flotation systems.” Background for Promulgated 
    Standards, supra
    , at 2-7.
    The government offers no rebuttal to this argument. Its brief merely
    repeats that Tanks 116 and 117 “were the separation tanks,” the “primary
    means of separating slop oil out of its wastewater system,” and were not “use[d]
    . . . as equalization basins.” Noticeably absent is an acknowledgment of the
    consequences of its preferred interpretation. Nowhere does the government
    offer any limiting principle or admit to a changed view. Instead it presses an
    interpretation that results in Subpart QQQ’s covering the entire wastewater
    treatment system, never mind that in every public pronouncement it took the
    contrary view.    We agree with what the government has said from the
    beginning— Subpart QQQ does not regulate equalization tanks.
    D.
    The government’s warning that this court’s reading of Subpart QQQ
    creates a “massive loophole,” allowing refineries to “avoid emissions controls
    merely by eliminating an ancillary part from a separation tank’s design,” is
    unpersuasive. For one thing, our interpretation does not leave equalization
    tanks unregulated; Subpart Kb still applies. Significantly, the government has
    never charged CITGO with violating Subpart Kb. For another, the EPA has
    all the tools needed to fix any loopholes arising from this decision. Through
    the Clean Air Act, Congress has given the EPA power to write regulations with
    the binding force of law and backed by civil and criminal penalties. The EPA
    retains the ability to rewrite the regulations, if necessary and appropriate.
    Subpart QQQ’s text, the overall regulatory scheme, and its promulgation
    history point to the inescapable conclusion that an equalization tank is not an
    16
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    No. 14-40128
    “oil-water separator.” To be an “oil-water separator” the equipment must be
    used to separate oil from water and it “consist” of a separation tank, which may
    have several basins, and skimmers, weirs, grit chambers, and sludge hoppers.
    Because the district court misstated the scope of the regulation, its jury
    instruction was erroneous. There is no doubt that this omission affected the
    outcome. CITGO’s CAA convictions must accordingly be reversed.
    II.
    We now turn to the MBTA convictions. A century ago, out of a shared
    desire to “sav[e] from indiscriminate slaughter and [to] insur[e] the
    preservation of such migratory birds as are either useful to man or are
    harmless” the United States and the United Kingdom (on behalf of Canada)
    agreed to “adopt some uniform system of protection.”            Migratory Bird
    Protection Agreement, U.S.-Can., Dec. 8, 1916, 39 Stat. 1702. To implement
    the new accord, Congress passed the Migratory Bird Treaty Act of 1918. As
    relevant here, the act makes it “unlawful at any time, by any means or in any
    manner, to pursue, hunt, take, capture, kill, attempt to take, capture, or kill
    . . . any migratory bird,”        in violation of regulations and permits.
    See 16 U.S.C. § 703(a); § 704(a). The act imposes strict liability on violators,
    punishable by a maximum $15,000 fine and six months imprisonment.
    16 U.S.C. § 707(a).
    In order to hold CITGO liable for three misdemeanor counts of “taking”
    migratory birds who died when they landed on Tanks 116 and 117, the district
    court conscientiously canvassed conflicting case law under the MBTA and drew
    three significant conclusions. First, the court held that an illegal “taking” is
    an ambiguous term that involves more activities than those related to hunting,
    poaching and intentional acts against migratory birds. See MBTA 
    Opinion, 893 F. Supp. 2d at 843
    –45. Second, the court held that strict liability requires,
    in this context, only that the actor proximately caused the illegal “taking.” 
    Id. 17 Case:
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    at 847. Third, the court apparently held that CITGO’s violation of federal and
    state regulations that required roofing these tanks could support the
    company’s misdemeanor convictions. 
    Id. On appeal,
    the government supports the first two conclusions, but
    CITGO asserts that illegally “taking” migratory birds involves only “conduct
    intentionally directed at birds, such as hunting and trapping, not [ ]
    commercial activity that unintentionally and indirectly causes” migratory bird
    deaths. Albeit with significant nuances in reasoning, cases can be found to
    support either position. 9 Compare Newton Cnty. Wildlife Ass’n v. U.S. Forest
    Serv., 
    113 F.3d 110
    , 115 (8th Cir. 1997), and Seattle Audubon Soc’y v. Evans,
    
    952 F.2d 297
    , 302 (9th Cir. 1991), with United States v. Apollo Energies, Inc.,
    
    611 F.3d 679
    , 686 (10th Cir. 2010); and United States v. FMC Corp., 
    572 F.2d 902
    , 905 (2d Cir. 1978). Reviewing this legal question de novo, see United
    States v. Morgan, 
    311 F.3d 611
    , 613 (5th Cir. 2002), we agree with the Eighth
    and Ninth circuits that a “taking” is limited to deliberate acts done directly and
    intentionally to migratory birds. Our conclusion is based on the statute’s text,
    its common law origin, a comparison with other relevant statutes, and rejection
    of the argument that strict liability can change the nature of the necessary
    illegal act. Accordingly, CITGO’s MBTA convictions must be reversed.
    9  District courts are similarly divided. Compare Mahler v. U.S. Forest Serv., 927 F.
    Supp. 1559, 1574 (S.D. Ind. 1996) (limiting MBTA to hunting like activities) with United
    States v. Moon Lake Elec. Ass’n, 
    45 F. Supp. 2d 1070
    , 1078-79 (D. Colo. 1999) (holding the
    opposite).
    18
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    A.
    CITGO was indicted for “taking” or “aiding and abetting the taking” of
    migratory birds, not for “killing” them. 10 We confine analysis to the charging
    term. The term “take” is “as old as law itself.” Babbitt v. Sweet Home Chapter
    Cmtys for a Great Or., 
    515 U.S. 687
    , 717, 
    115 S. Ct. 2407
    , 2422 (1995) (Scalia,
    J., dissenting); see also 2 WILLIAM BLACKSTONE, COMMENTARIES *411 (tracing
    the “right of pursuing, taking, and destroying” game back to Roman imperial
    law). Justice Scalia’s discussion of “take” as used in the Endangered Species
    Act is not challenged here by the government, nor was it criticized by the
    majority in Sweet Home, because Congress gave “take” a broader meaning for
    that statute. See Sweet 
    Home, 515 U.S. at 698
    n.10, 115 S. Ct. at 2413 
    n.10.
    “[A]bsent contrary indications,” courts presume that “Congress intends to
    adopt the common law definition of statutory terms.”                       United States v.
    Shabani, 
    513 U.S. 10
    , 13, 
    115 S. Ct. 2407
    , 2422 (1995). As applied to wildlife,
    to “take” is to “reduce those animals, by killing or capturing, to human control.”
    Sweet 
    Home, 515 U.S. at 717
    , 115 S. Ct. at 2422 (Scalia, J., dissenting); accord
    Geer v. Connecticut, 
    161 U.S. 519
    , 523, 
    16 S. Ct. 600
    , 602 (1896), overruled on
    other grounds by Hughes v. Oklahoma, 
    441 U.S. 322
    , 
    99 S. Ct. 1727
    (1979);
    Ward v. Race Horse, 
    163 U.S. 504
    , 507, 
    16 S. Ct. 1076
    , 1077 (1896). One does
    not reduce an animal to human control accidentally or by omission; he does so
    affirmatively.
    The government disputes that the common law definition is so limited.
    Its brief asserts that, at the time Congress passed the act, “take” was not
    10 Although this case does not present an opportunity to interpret “kill,” there is reason
    to think it too is limited to intentional acts aimed at migratory birds. At least one court has
    questioned whether “kill” has any independent meaning or is “only mentioned as the usual
    result of pursuing, hunting, or capturing.” United States v. FMC Corp., 
    572 F.2d 902
    , 903
    n.1 (2d Cir. 1978). A contemporary statute, the Migratory Bird Conservation Act, 16 U.S.C.
    § 715, similarly intimates that “kill” may have little independent force, as it lists “kill” as
    19
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    limited to hunting and trapping and that it had a wide variety of
    contemporaneous meanings. For support, the government looks to United
    States v. Moon Lake Elec. Ass’n, 
    45 F. Supp. 2d 1070
    , 1078-79 (D. Colo. 1999),
    which lists every possible meaning for that term contained in the 1920 edition
    of Webster’s dictionary. That “take” can or might have had a wide range of
    meanings is not determinative, because when the MBTA was passed in 1918,
    “take” was a well-understood term of art under the common law when applied
    to wildlife. See 
    Geer, 161 U.S. at 523
    , 16 S. Ct. at 602. The government does
    not explain why Congress implicitly intended to vary from the common law
    meaning in the MBTA. See 
    Shabani, 513 U.S. at 13
    , 115 S. Ct. at 384. 11
    A simple comparison with related statutes, both enacted fifty or more
    years later, shows that Congress well knew how to expand “take” beyond its
    common law origins to include accidental or indirect harm to animals. The
    Endangered Species Act (“ESA”) explicitly defines “take” to mean “harass,
    harm, pursue, hunt, shoot, wound, kill, trap, capture, or collect, or to attempt
    to engage in any such conduct.” 16 U.S.C. § 1532(19) (emphasis added). The
    inclusion of “harass” and “harm” modified the common law definition. The
    term “harass,” as interpreted by the ESA’s regulations, includes not just
    intentional acts, but a “negligent act or omission.” 50 C.F.R. § 17.3; see also
    Sweet 
    Home, 55 U.S. at 707
    , 115 S. Ct. at 687 (approving this expansive
    part of the definition of “take.” See 16 U.S.C. § 715n. Even if “kill” does have independent
    meaning, the Supreme Court, interpreting a similar list in the ESA, concluded that the terms
    pursue, hunt, shoot, wound, kill, trap, capture, and collect, generally refer to deliberate
    actions. Sweet 
    Home, 515 U.S. at 698
    n.11, 115 S. Ct. at 2413
    . Accordingly, there is reason
    to think that the MBTA’s prohibition on “killing” is similarly limited to deliberate acts that
    effect bird deaths.
    11 The government raises a straw man by arguing that “take” must mean more than
    the common law definition because the MBTA also regulates commercial activities
    concerning migratory birds. There is no linguistic connection between “taking” and the
    commercial exploitation of the birds and their eggs under MBTA. Moreover, the
    government’s argument is at odds with the common law definition of “take” in the MBTA
    regulations. See 50 C.F.R. § 10.12.
    20
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    reading of “take”). Similarly, “harm” encompasses not only acts that directly
    result in the death of endangered species, but also any “act which actually kills
    or injures wildlife.” 50 C.F.R. § 17.3. In the Marine Mammal Protection Act
    (“MMPA”), 16 U.S.C. § 1372(a), Congress          also chose to     define “take,”
    differently from the common law, to mean “harass, hunt, capture, or kill, or
    attempt to harass, hunt, capture, or kill any marine mammal.” 16 U.S.C.
    § 1362(13).   The accompanying regulations again interpret “harass” (and
    therefore “take”) to include negligent acts that indirectly disturb or molest a
    marine mammal. 50 C.F.R. § 216.3. The absence from the MBTA of terms like
    “harm” or “harass”, or any other language signaling Congress’s intent to modify
    the common law definition supports reading “take” to assume its common law
    meaning.
    The MBTA adds that the covered activities—pursuit, hunt, taking,
    capturing, killing—are illegal if committed “at any time, by any means, in any
    manner.” 16 U.S.C. § 703(a). The addition of adverbial phrases connoting
    “means” and “manner,” however, does not serve to transform the nature of the
    activities themselves. For instance, the manner and means of hunting may
    differ from bowhunting to rifles, shotguns, and air rifles, but hunting is still a
    deliberately conducted activity. Likewise, rendering all-inclusive the manner
    and means of “taking” migratory birds does not change what “take” means, it
    merely modifies the mode of the take.
    The government does not refute this exegesis, at least not directly.
    Instead, it argues that Congress expanded the definition of “take” by negative
    implication. The argument goes like this: In 2002, a district court held that
    the United States military violated the MBTA when migratory birds were
    accidentally killed during training exercises in the Pacific. Ctr. for Biological
    Diversity v. Pirie, 
    161 F. Supp. 2d 161
    , 163-64 (D.D.C. 2002), vacated as moot
    sub nom. Ctr. for Biological Diversity v. England, No. 02-5163, 
    2003 WL 21
        Case: 14-40128       Document: 00513186668         Page: 22     Date Filed: 09/09/2015
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    179848 (D.C. Cir. Jan. 23, 2003). In response, Congress quickly exempted
    “military readiness activity” from MBTA liability for incidental takings. See
    Bob Stump National Defense Authorization Act for Fiscal Year 2003, Pub. L.
    No. 107-314, § 315(d), 116 Stat. 2458, 2509-10 (2002) (requiring the Secretary
    of the Interior to exercise its authority under the MBTA to “prescribe
    regulations to exempt the Armed Forces for the incidental taking of migratory
    birds during military readiness activities”). The exemption did not extend to
    the “operation of industrial facilities,” even though the government had
    previously prosecuted activities that indirectly affect birds. 
    Id. § 315(f)(2)(B)
    (exempting from “military readiness activities,” the “operation of industrial
    activities”).    Accordingly, the government asserts, Congress implicitly
    expanded “take” beyond its common-law meaning.
    This argument makes no sense. A single carve-out from the law cannot
    mean that the entire coverage of the MBTA was implicitly and hugely
    expanded. More to the point, this was an exceptionally narrow exemption, as
    it did not even protect all military activities. By proceeding in a carefully
    targeted way, Congress had no reason to address the full scope of the MBTA. 12
    The statute’s scope was at that time uncertain in the courts; both the Eighth
    and Ninth Circuits had limited “takes” to hunting and poaching activities,
    while the Second Circuit had not. See Newton Cnty. Wildlife 
    Ass’n, 113 F.3d at 115
    ; Seattle Audubon 
    Soc’y, 952 F.2d at 303
    ; FMC 
    Corp., 572 F.2d at 908
    .
    Whether Congress deliberately avoided more broadly changing the MBTA or
    simply chose to address a discrete problem, the most that can be said is that
    Congress did no more than the plain text of the amendment means.
    12 For what it’s worth, the year after Congress enacted the ESA with its intentionally
    broader definition of “take,” Congress amended the MBTA but failed to broaden the meaning
    of “take.” See An Act to Amend the Migratory Bird Act of July 3, 1918, Pub. L. No. 93-300,
    88 Stat. 190 (1974) (amending the MBTA to include the new environmental treaty concluded
    between the U.S. and Japan).
    22
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    Enacted against an indisputable common law background, the MBTA’s
    use of “take,” as in “pursue, take or destroy” animals, is fortified by the absence
    of temporizing modifiers like “harm” or “harass.”               The government omits
    reference to regulations under the statute, which essentially parallel the
    MBTA’s language and conspicuously fail to incorporate “harm” or “harass.” See
    50 C.F.R. § 10.12 (“Take” means to “pursue, hunt, shoot, wound, kill, trap,
    capture or collect.”) In stark contrast are the ESA and the MMPA in text and
    accompanying regulations. Like the Ninth Circuit, we find these differences
    “distinct and purposeful.” Seattle Audubon 
    Soc’y, 952 F.2d at 302
    . Harm and
    harass are the terms Congress uses when it wishes to include negligent and
    unintentional acts within the definition of “take.” Without these words, “take”
    assumes its common law definition.
    B.
    Courts that have read the MBTA broadly, mainly the Second and Tenth
    Circuits, disagree with our ultimate conclusion, but not our analysis of the
    MBTA’s text. Instead, these courts hold that because the MBTA imposes strict
    liability, it must forbid acts that accidentally or indirectly kill birds. The
    Second Circuit adopted this view in United States v. FMC Corp., 
    572 F.2d 902
    (2d Cir. 1978). There, the government prosecuted a pesticide manufacturer
    that had inadvertently polluted a wastewater pond with a poisonous compound
    that killed migratory birds. On appeal, FMC argued that to violate the MBTA,
    “there must be an intent to harm birds culminating in their death” and that “it
    took no affirmative act” to kill birds.            
    Id. at 906.
         The Second Circuit
    disagreed. 13 It noted that “the term ‘act’ itself is ambiguous” because “a person
    13 The meaning of “take” was not before the court, as the jury was charged about a
    “killing” of birds. See FMC 
    Corp., 572 F.2d at 903
    . Nevertheless, the government argues
    that FMC’s analysis is relevant here because the Second Circuit saw little difference between
    “killing” and “taking” under the MBTA. See supra note 10.
    23
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    failing to act when he has a duty to do so may be held to be criminally liable
    just as one who has acted improperly.” 
    Id. FMC had
    acted by manufacturing
    a dangerous chemical and failing to prevent that chemical from reaching the
    pond. 
    Id. at 907.
    The court acknowledged that it must balance the objectives
    of the MBTA with “a reluctance to charge anyone with a crime which he does
    not know he is committing,” and it was aware of potentially unlimited liability
    under the act for negligent “killing” of birds. 
    Id. at 905.
    Such consequences,
    the court soothed, could be remedied by sound prosecutorial discretion. 
    Id. Perhaps in
    further amelioration of the reach it was imputing to the MBTA, the
    court analogized FMC’s situation to tort notions of strict liability for conducting
    ultra-hazardous activities. 
    Id. at 907.
    Because manufacturing pesticides is
    such an activity, the court reasoned, FMC was liable regardless how indirect
    or accidental the poisonings. 
    Id. In United
    States v. Apollo Energies, the Tenth Circuit upheld the
    misdemeanor convictions of two Kansas oil rig operators for violating the
    MBTA after dead birds were found trapped in heater treaters, tall, cylindrical
    devices used at oil drilling 
    sites. 611 F.3d at 681
    . On appeal, the defendants
    argued that violating the MBTA in this manner is not a strict liability crime
    and, alternatively, that the MBTA is unconstitutionally vague. 
    Id. As in
    FMC,
    no issue was raised about the meaning of “take.” In the course of rejecting both
    contentions, the court addressed whether the MBTA applies to “activities
    beyond purposeful hunting or possession of migratory birds.” 
    Id. at 686.
    The
    court observed that all the cases limiting the MBTA to hunting activities
    “involved logging or pesticide application that modified bird habitat in some
    way.” 
    Id. In contrast,
    the case before it involved “whether unprotected oil field
    equipment can take or kill migratory birds.” The court found such a conclusion
    “obvious.” 
    Id. 24 Case:
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    We decline to adopt the broad, counter-textual reading of the MBTA by
    these circuits. No doubt because the defendants failed to make the argument
    (and in FMC the issue was “kill” not “take” under the MBTA), neither of these
    decisions explores the meaning of “take.” More fundamentally, we disagree
    that because misdemeanor MBTA violations are strict liability crimes, a “take”
    includes acts (or omissions) that indirectly or accidentally kill migratory birds.
    These and like decisions confuse the mens rea and the actus reus requirements.
    Strict liability crimes dispense with the first requirement; the government
    need not prove the defendant had any criminal intent. But a defendant must
    still commit the act to be liable. Further, criminal law requires that the
    defendant commit the act voluntarily.       WAYNE R. LAFAVE, CRIMINAL LAW
    § 5.2(e) (5th ed. 2010). “To some extent, then, all crimes of affirmative action
    require something in the way of a mental element—at least an intention to
    make the bodily movement that constitutes that act which the crime requires.”
    
    Id. Here, that
    act is “to take” which, even without a mens rea, is not something
    that is done unknowingly or involuntarily. Accordingly, requiring defendants,
    as an element of an MBTA misdemeanor crime, to take an affirmative action
    to cause migratory bird deaths is consistent with the imposition of strict
    liability. See, e.g., United States v. Morgan, 
    311 F.3d 611
    , 616 (5th Cir. 2002).
    There is no doubt that a hunter who shoots a migratory bird without a
    permit in the mistaken belief that it is not a migratory bird may be strictly
    liable for a “taking” under the MBTA because he engaged in an intentional and
    deliberate act toward the bird. Cf. Sweet 
    Home, 515 U.S. at 722
    , 115 S. Ct. at
    2425 (Scalia, J., dissenting) (hunter’s mistaken shooting of an elk is a
    “knowing” act that renders him strictly liable under the ESA); United States v.
    Kapp, 
    419 F.3d 666
    , 673 (7th Cir. 2005) (holding Kapp liable under the ESA
    25
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    over objection that the exotic cats he killed were unprotected hybrids). 14 A
    person whose car accidentally collided with the bird, however, has committed
    no act “taking” the bird for which he could be held strictly liable. Nor do the
    owners of electrical lines “take” migratory birds who run into them. These
    distinctions are inherent in the nature of the word “taking” and reveal the
    strict liability argument as a non-sequitur.
    We decline to adopt those courts’ interpretation of the MBTA that
    substitutes the statute’s misdemeanor criminal liability standard for what the
    Act deems criminal. We agree with the Eighth and Ninth Circuits, which,
    recognizing this distinction, have placed decisive weight on the meaning of
    “take.”
    C.
    After surveying many circuit and district court cases, the district court
    adopted the Tenth Circuit’s position and held it “obvious” that “unprotected oil
    field equipment can take or kill migratory birds.” MBTA Opinion, 
    893 F. Supp. 2d
    at 847 (quoting Apollo 
    Energies, 611 F.3d at 686
    ). The district court also
    adopted the Tenth Circuit’s proximate cause requirement for strict liability
    and found that the birds’ deaths were directly, foreseeably caused by the lack
    of roofing on Tanks 116 and 117. 
    Id. The court
    distinguished its result from
    other district court cases that dismissed similar MBTA indictments arising
    from oil field operations because CITGO left Tanks 116 and 117 uncovered in
    violation of the Clean Air Act and Texas law. 15 See 
    id. at 846
    (citing United
    14 Poisoning a field to deter birds, and “taking” migratory birds in the process, would
    also violate the MBTA under our reading. See United States v. Van Fossan, 
    899 F.2d 636
    ,
    637 (7th Cir. 1990) (upholding conviction for spreading corn and wheat laced with poison
    designed to disperse birds congregating on defendant’s property).
    15 Texas law requires oil operators to “take protective measures necessary to prevent
    harm to birds.” 16 TEX. ADMIN. CODE § 3.22(a). In particular, operators must “screen, net,
    cover, or otherwise render harmless to birds” large open-top storage tanks. 
    Id. § 3.22(b)(1).
                                                 26
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    States v. Chevron USA, Inc., No. 09-CR-0132, 
    2009 WL 3645170
    (W.D. La. Oct.
    30, 2009), Brigham Oil & 
    Gas, 840 F. Supp. 2d at 1202
    , United States v.
    ConocoPhillips Co., 
    2011 WL 4709887
    (D.N.D. Aug. 10, 2011)). Aside from our
    critique of the Apollo Energies conclusion, there are at least two flaws in the
    district court’s attempt to reconcile its approach with other oil field cases. Most
    importantly, the MBTA’s text provides no basis, explicitly or implicitly, for
    criminalizing migratory bird deaths because they result from violations of
    other state or federal laws. Second, as already discussed, CITGO did not
    violate the Clean Air Act, the only law which the government accused it of
    violating. Moreover, although the district court accused CITGO of violating
    state law, the company was never charged or convicted of state law violations.
    Thus, even under the district court’s erroneous legal interpretation, the MBTA
    convictions must be overturned.
    D.
    We note a final factor that supports our interpretation of the MBTA. The
    scope of liability under the government’s preferred interpretation is hard to
    overstate. The MBTA protects approximately 836 species of birds. Brigham
    Oil & Gas, 
    L.P., 840 F. Supp. 2d at 1202
    . According to the U.S. Fish and
    Wildlife Service, between 97 and 976 million birds are killed annually by
    running into windows.       U.S. FISH & WILDLIFE SERV., MIGRATORY BIRD
    MORTALITY, MANY HUMAN-CAUSED THREATS AFFLICT OUR BIRD POPULATIONS
    2 (2002). Communication towers kill an additional four to five million birds
    each year, though the government estimates the number may be closer to forty
    or fifty million. 
    Id. Cars may
    kill approximately 60 million birds each year.
    
    Id. Even domesticated
    cats are serial violators of the MBTA. In Wisconsin
    alone, the government estimates that domesticated cats killed 39 million birds.
    
    Id. The government
    refused to speculate on the number of birds that cats kill
    nationwide, though it would certainly be “much higher.” 
    Id. 27 Case:
    14-40128       Document: 00513186668         Page: 28     Date Filed: 09/09/2015
    No. 14-40128
    If the MBTA prohibits all acts or omissions that “directly” kill birds,
    where bird deaths are “foreseeable,” then all owners of big windows,
    communication towers, wind turbines, solar energy farms, cars, cats, and even
    church steeples 16 may be found guilty of violating the MBTA. This scope of
    strict criminal liability would enable the government to prosecute at will and
    even capriciously (but for the minimal protection of prosecutorial discretion)
    for harsh penalties: up to a $15,000 fine or six months’ imprisonment (or both)
    can be imposed for each count of bird “taking” or “killing.”                       Equally
    consequential and even more far-reaching would be the societal impact if the
    government began exercising its muscle to prevent “takings” and “killings” by
    regulating every activity that proximately causes bird deaths. The absurd
    results that the government’s interpretation would cause further bolsters our
    confidence that Congress intended to incorporate the common-law definition of
    ‘take’ in the MBTA.
    CONCLUSION
    Differing with the district court’s conclusions, we hold that Subpart
    QQQ only regulates equipment conventionally, not merely functionally,
    known as oil-water separators, along with specifically described ancillary
    equipment.       Equalization Tanks 116 and 117 at CITGO’s Corpus Christi
    refinery are outside the regulatory definition and thus are not “oil-water
    separators” under Subpart QQQ. Further, the MBTA’s ban on “takings” only
    prohibits intentional acts (not omissions) that directly (not indirectly or
    accidentally) kill migratory birds. Accordingly, we REVERSE the convictions
    and REMAND with instructions to enter a judgment of acquittal on Counts
    Four, Five, Eight, Nine and Ten.
    In the toddler book, “My Nest is Best,” the bird family escapes from a church steeple
    16
    where the eggs in its nest were imperiled by the ringing of the bell.
    28
    Case: 14-40128    Document: 00513186668    Page: 29   Date Filed: 09/09/2015
    No. 14-40128
    REVERSED and REMANDED with INSTRUCTIONS.
    29