Rohan Ramsingh v. TSA ( 2022 )


Menu:
  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued February 2, 2022                 Decided July 15, 2022
    No. 21-1170
    ROHAN RAMSINGH,
    PETITIONER
    v.
    TRANSPORTATION SECURITY ADMINISTRATION,
    RESPONDENT
    On Petition for Review of an Order of the
    Transportation Security Administration
    Jonathan Corbett argued the cause and filed the briefs for
    petitioner.
    Kyle T. Edwards, Attorney, U.S. Department of Justice,
    argued the cause for respondent. With her on the brief were
    Brian M. Boynton, Acting Assistant Attorney General at the
    time the brief was filed, and Sharon Swingle, Attorney.
    Before: ROGERS, MILLETT, and KATSAS, Circuit Judges.
    Opinion for the Court filed by Circuit Judge MILLETT.
    MILLETT, Circuit Judge: Shortly before Thanksgiving
    2019, Rohan Ramsingh, an Army veteran, arrived at the Tampa
    2
    International Airport to pick up two of his children who were
    visiting for the holiday. After a swab of Ramsingh’s hands
    tested positive for traces of explosive material, screening
    personnel from the Transportation Security Administration
    attempted to perform a full-body pat-down. Citing medical
    reasons, Ramsingh repeatedly refused to be patted down and
    was subsequently escorted away from the checkpoint by law
    enforcement.
    The agency assessed Ramsingh a civil penalty for
    “interfer[ing] with * * * screening personnel in the
    performance of their screening duties[.]”   
    49 C.F.R. § 1540.109
    .
    Ramsingh petitioned this court to overturn the penalty on
    the ground that his refusal to submit to a pat-down, particularly
    in light of his medical justifications, did not constitute
    interference under the regulation. Because, on the record in
    this case, the agency lawfully applied its interference
    regulation to Ramsingh’s conduct, we deny the petition for
    review.
    I
    A
    Congress has charged the Transportation Security
    Administration (“TSA”) with “safeguard[ing] this country’s
    civil aviation security and safety.” Corbett v. TSA, 
    19 F.4th 478
    , 480 (D.C. Cir. 2021). The agency has “broad authority”
    to “identify ‘threats to transportation’ and take the appropriate
    steps to respond to those threats.” 
    Id. at 480, 486
     (quoting 
    49 U.S.C. § 114
    (f)(2), (3)).
    As relevant here, Congress directed the TSA to “provide
    for the screening of all passengers and property * * * that will
    3
    be carried aboard a passenger aircraft[.]”            
    49 U.S.C. § 44901
    (a). To that end, TSA promulgated a regulation stating
    that “[n]o individual may enter a sterile area or board an aircraft
    without submitting to the screening and inspection of his or her
    person and accessible property[.]” 
    49 C.F.R. § 1540.107
    (a).
    The “sterile area” is the “portion of an airport * * * that
    provides passengers access to boarding aircraft and to which
    the access generally is controlled by TSA[.]” 
    Id.
     § 1540.5.
    Individuals and their property are inspected for, among other
    things, “weapons, explosives, and incendiaries.” Id.
    TSA regulations specify that “[n]o person may interfere
    with, assault, threaten, or intimidate screening personnel in the
    performance of their screening duties[.]”            
    49 C.F.R. § 1540.109
    . The aim of Section 1540.109 is to “prohibit[]
    interference that might distract or inhibit a screener from
    effectively performing his or her duties.” Civil Aviation
    Security Rules, 
    67 Fed. Reg. 8,340
    , 8,344 (Feb. 22, 2002).
    TSA explained that “[t]his rule is necessary to emphasize the
    importance to safety and security of protecting screeners from
    undue distractions or attempts to intimidate.” 
    Id.
     “[A]busive,
    distracting behavior, and attempts to prevent screeners from
    performing required screening, are subject to civil penalties[.]”
    Id.1
    B
    To ensure that all individuals are fully screened before
    gaining access to the boarding area, TSA relies on a
    combination of walk-through metal detectors, Advanced
    Imaging Technology (“AIT”) machines, explosive trace
    detection tests, and pat-downs. AIT machines can screen for
    1
    Interference with security personnel that rises to the level of
    assault is also subject to criminal penalties under 
    49 U.S.C. § 46503
    .
    4
    both metallic and non-metallic threats, addressing “a critical
    weakness in aviation security” that existed when only metal
    detectors were used. Passenger Screening Using Advanced
    Imaging Technology, 
    81 Fed. Reg. 11,364
    , 11,365 (March 3,
    2016). While AIT machines have become standard in airports
    across the United States, “[p]assengers generally may decline
    AIT screening and opt instead for a pat-down.” 
    Id.
    Other circumstances in which a passenger may be required
    to undergo a pat-down include “if the screening technology
    alarms, as part of unpredictable security measures, [or] for
    enhanced screening[.]”          Security Screening, TSA,
    https://www.tsa.gov/travel/security-screening (last accessed
    July 7, 2022) (“Pat-Down Screening” drop-down box). A pat-
    down “may include inspection of the head, neck, arms, torso,
    legs, and feet[,]” as well as “sensitive areas such as breasts,
    groin, and the buttocks.” 
    Id.
    TSA provides limited screening accommodations for those
    with disabilities and medical conditions, but the agency
    emphasizes that persons with such conditions must also
    “undergo screening at the checkpoint.” Disabilities and
    Medical Conditions, TSA, https://www.tsa.gov/travel/special-
    procedures (last accessed July 7, 2022).
    TSA requires that once an individual has begun the
    screening process, he or she must complete it. See Appendix
    (“A.”) 63–64, 86, 88, 205–206, 290, 296; see also 81 Fed. Reg.
    at 11,385. Individuals are not allowed to leave partway
    through. After all, permitting an individual “to revoke consent
    to an ongoing airport security search makes little sense in a
    post-9/11 world.” United States v. Aukai, 
    497 F.3d 955
    , 960
    (9th Cir. 2007) (en banc); see A. 296. Letting individuals self-
    select out of the process once faced with additional screening,
    in particular, “would afford terrorists multiple opportunities to
    5
    attempt to penetrate airport security by ‘electing not to fly’ on
    the cusp of detection until a vulnerable portal is found[,]” and
    would supply terrorists with a “low-cost method of detecting
    systematic vulnerabilities in airport security, knowledge that
    could be extremely valuable in planning future attacks.” Aukai,
    
    497 F.3d at
    960–961 (footnote omitted).
    II
    A
    On November 23, 2019, Ramsingh arrived at the Tampa
    International Airport, along with his girlfriend and child, to
    pick up Ramsingh’s other two minor children who were
    arriving unaccompanied on a flight from Houston. After
    receiving gate passes from the airline, they entered the security
    checkpoint. When Ramsingh attempted to proceed through the
    walk-through metal detector, Transportation Security Officer
    Julio Melendez Ortiz instructed him to go through the AIT
    machine instead. Ramsingh stated that, due to a shoulder injury
    incurred during military service, he could not lift both arms
    above his head, as required by the AIT machine. Officer
    Melendez Ortiz then permitted Ramsingh to use the walk-
    through metal detector.
    TSA procedures require that a traveler who declines AIT
    screening undergo an explosive trace detection test, so Officer
    Melendez Ortiz swabbed Ramsingh’s hands. See A. 83 (TSA
    officer stating in an affidavit that “the passenger opted out of
    the AIT screening,” so “his hands were [explosive trace
    detection tested] pursuant to policy”); A. 204 (“TSA Standard
    Operating Procedures * * * required that [Ramsingh] receive
    an Explosive Trace Detection * * * test on his hands.”). The
    test came back positive for possible components of explosives,
    which prompted Officer Melendez Ortiz to notify his
    supervisor.
    6
    Supervisory Transportation Security Officer Tiffany
    Pagan informed Ramsingh that TSA would need to conduct a
    full-body pat-down and further screening of his property to
    clear the positive explosives alarm. Ramsingh objected to the
    pat-down, explaining that he suffers from Post-Traumatic
    Stress Disorder and Military Sexual Trauma, conditions which
    would be triggered by a full-body pat-down. Officer Pagan
    then asked one of her male colleagues, Supervisory
    Transportation Security Officer Robert McClelland, to assist.
    While acknowledging Ramsingh’s medical concerns, Officer
    McClelland insisted that there was “no alternative” to a pat-
    down for resolving an explosive trace detection alarm. A. 83.
    Ramsingh continued to refuse. Officer McClelland next
    offered to conduct the pat-down in a private or less crowded
    area of the checkpoint, but Ramsingh declined.
    At some point, Ramsingh indicated that he did not wish to
    continue with the screening process, stating “I can just leave”
    and “you can’t detain me.” A. 83. Officer McClelland
    acknowledged that TSA could not detain him but advised
    Ramsingh that if he did not comply with required screening
    procedures, TSA would have to call law enforcement to the
    checkpoint. Ramsingh replied “fine, call them.” A. 83. The
    Transportation Security Manager and another officer
    subsequently arrived at the checkpoint, but they too were
    unable to convince Ramsingh to submit to a full-body pat-
    down.
    Approximately twenty minutes after the encounter
    between Ramsingh and TSA personnel began, law enforcement
    officers arrived and peaceably escorted Ramsingh away from
    the checkpoint. In the meantime, Ramsingh’s girlfriend had
    picked the arriving children up from their flight.
    7
    B
    1
    TSA does not dispute the legitimacy of Ramsingh’s
    medical conditions and acknowledges that Ramsingh
    communicated those medical conditions to the TSA officers on
    the scene. Nevertheless, in May 2020, TSA charged Ramsingh
    with violating 
    49 C.F.R. § 1540.109
    ’s prohibition on
    interfering with security personnel and sought a civil penalty
    of $2,050.
    Ramsingh requested a formal hearing before an
    Administrative Law Judge (“ALJ”). The ALJ upheld the civil
    penalty, finding that Ramsingh “refused to allow a pat-down
    search to complete screening,” A. 250, and that “TSA’s
    interpretation of its regulations—that once an individual begins
    the screening process at the airport, a refusal to complete the
    screening process constitutes ‘interference’ with the screener’s
    performance of his/her screening duties”—was “reasonable[,]”
    A. 256–257.
    The ALJ also ruled that Ramsingh’s medical conditions
    did not excuse his noncompliance. The ALJ explained that the
    security interests served by uniformly requiring travelers to
    complete screening once the process has begun outweighed
    Ramsingh’s medical concerns, especially because Ramsingh
    made a “voluntar[y]” choice to initiate the screening process,
    knowing “that he may be subject to a pat[-]down[.]” A. 256.
    While Ramsingh’s medical conditions did “not provide a
    valid defense[,]” the ALJ “considered [them] in mitigation[,]”
    along with Ramsingh’s lack of prior violations, and reduced the
    penalty to $680. A. 256.
    8
    2
    Ramsingh took an administrative appeal, and the TSA
    affirmed.
    The TSA first concluded that the ALJ’s findings of fact
    were supported by a preponderance of the evidence. Ramsingh
    disputed that he had “refused” the pat-down, arguing that
    “[j]ust as one would not say that a paraplegic ‘refused’ to stand,
    [he] did not ‘refuse,’ but was unable, to comply.” A. 263
    (citation omitted). The TSA rejected that argument, pointing
    out Ramsingh’s admission before the ALJ that he had “refused
    the private screening and continued to refuse to submit to the
    pat-down[.]” A. 293 (citation omitted).
    Next, the TSA affirmed the ALJ’s legal conclusion that
    Ramsingh “interfere[d]” with screening personnel in violation
    of 
    49 C.F.R. § 1540.109
    . The agency ruled that both the plain
    meaning of the word “interfere” and the purpose of the
    regulation capture Ramsingh’s “refusal to complete the
    screening process[.]”      A. 295.    That is because his
    noncompliance “inhibited the screeners from resolving the
    positive test for explosives and completing the screening
    process[,]” and so “prevented TSA [officers] from thoroughly
    performing their duties[.]” A. 295.
    Ramsingh argued that the ALJ erred because Section
    1540.109 requires an intentional mens rea. The TSA
    disagreed, explaining that Section 1540.109 qualifies as a
    public welfare regulation designed “to protect the safety and
    security of the flying public[,]” and so no mens rea is
    necessary. A. 299–300.
    At a minimum, Ramsingh insisted, the regulation requires
    a volitional act, and failing to comply on the basis of medical
    inability cannot be considered volitional. The TSA disagreed,
    9
    concluding that Ramsingh engaged in a volitional act by
    entering the security screening process with knowledge that he
    might be required to undergo a pat-down, and another
    volitional act by refusing to be patted down after he tested
    positive for potential explosives.
    With respect to the ALJ’s conclusion that Ramsingh’s
    medical conditions did not excuse his interference, the TSA
    determined that precedent and policy justifications support
    requiring an individual who begins the screening process to
    complete it or else be found liable for interference, regardless
    of the reason for failure to comply. A rule to the contrary, TSA
    concluded, would “require a fundamental change to TSA’s
    security program * * * that would adversely affect TSA’s
    ability to protect the aviation system.” A. 301.
    Finally, the TSA agreed that a $680 penalty was
    appropriate.2
    Ramsingh filed a timely petition for review in this court.
    III
    This court has jurisdiction over Ramsingh’s petition for
    review under 
    49 U.S.C. § 46110
    .
    In reviewing a petition under Section 46110, we uphold
    the agency’s decision unless it is “arbitrary, capricious, an
    abuse of discretion, or otherwise not in accordance with law[,]”
    
    5 U.S.C. § 706
    (2)(A), or unsupported by “substantial
    evidence,” 
    49 U.S.C. § 46110
    (c); see Suburban Air Freight,
    2
    Ramsingh has not independently challenged the size of the
    fine. See Oral Arg. Tr. 12:15–18 (“You haven’t independently
    challenged a sizable fine?” “It’s not the size of the fine that’s the
    issue here, no.”).
    10
    Inc. v. TSA, 
    716 F.3d 679
    , 681 (D.C. Cir. 2013). The arbitrary
    and capricious standard is “deferential[,]” merely requiring that
    the agency action be “reasonable and reasonably explained.”
    POET Biorefining, LLC v. EPA, 
    970 F.3d 392
    , 409 (D.C. Cir.
    2020) (citation omitted).
    IV
    Ramsingh argues that TSA erred by concluding that (1) he
    violated 
    49 C.F.R. § 1540.109
    ’s prohibition on interference
    merely by failing to comply with the required screening
    procedures, and (2) his bona fide medical conditions did not
    excuse noncompliance.
    A
    1
    The central question raised by Ramsingh in this case is
    whether the TSA reasonably concluded that his refusal to
    submit to a full-body pat-down after voluntarily entering a
    screening area “interfere[d]” with the TSA’s screening process,
    within the meaning of 
    49 C.F.R. § 1540.109
    . The TSA’s
    conclusion that such interference occurred was adequately
    reasoned and supported by substantial evidence. In so holding,
    we need not accord deference to TSA’s interpretation of its
    regulation under Kisor v. Wilkie, 
    139 S. Ct. 2400
     (2019),
    because, after “exhaust[ing] all the ‘traditional tools’ of
    construction[,]” we conclude that the regulation is not
    “genuinely ambiguous,” 
    id. at 2415
     (quoting Chevron U.S.A.
    Inc. v. Natural Res. Def. Council, Inc., 
    467 U.S. 837
    , 843 n.9
    (1984)).
    TSA regulations do not define “interfere,” so we begin
    with the “ordinary, contemporary, common meaning” of the
    term. Williams v. Taylor, 
    529 U.S. 420
    , 431 (2000) (citation
    11
    omitted). Webster’s New International Dictionary defines
    “interfere” as “to come in collision[,]” “to be in opposition[,]”
    and “to run at cross-purposes[.]” Interfere, WEBSTER’S NEW
    INT’L DICTIONARY 1178 (def. 2) (3d ed. 2002); see also
    Interfere, WEBSTER’S NEW COLLEGE DICTIONARY 578 (def. 1)
    (2d ed. 1999) (defining “interfere” as “[t]o come between so as
    to be an impediment”); Interference, BLACK’S LAW
    DICTIONARY 818 (def. 2) (7th ed. 1999) (defining
    “interference” as “[a]n obstruction or hindrance”). Common
    synonyms for “interfere” include “impede, obstruct, stand in
    the way of, hinder, * * * [and] hamper.” Interfere, THE
    OXFORD AMERICAN WRITER’S THESAURUS 490 (def. 1) (2004)
    (formatting modified).
    In the same vein, this court has recently defined the
    “ordinary meaning” of interfere as “to interpose in a way that
    hinders or impedes: comes into collision or be in opposition.”
    Judge Rotenberg Educ. Ctr., Inc. v. FDA, 
    3 F.4th 390
    , 396
    (D.C. Cir. 2021) (quoting Interfere, Merriam-Webster.com,
    https://www.merriam-webster.com/dictionary/interfere (last
    accessed July 7, 2022)). And in a case interpreting Section
    1540.109 itself, the Sixth Circuit defined the term “interfere”
    in the regulation as to engage in “conduct which poses an actual
    hindrance to the accomplishment of a specified task.” Rendon
    v. TSA, 
    424 F.3d 475
    , 480 (6th Cir. 2005) (internal quotation
    marks and citation omitted).
    Given that established meaning, the TSA logically
    concluded that Ramsingh’s conduct interfered with TSA
    personnel engaged in screening operations. TSA policy
    requires that whenever an individual triggers a positive
    explosives alarm, he or she must undergo a full-body pat-down.
    Ramsingh’s repeated resistance to being patted down was “in
    opposition” to and “r[a]n at cross-purposes” with that policy.
    Interfere, WEBSTER’S NEW INT’L DICTIONARY, supra.
    12
    Likewise, his insistence on leaving the checkpoint rather than
    undergo the pat-down “hinder[ed]” and “impede[d],” Judge
    Rotenberg Educ. Ctr., 3 F.4th at 396 (citation omitted), the
    TSA officers’ ability to enforce the requirement that a person
    who begins screening must see the process through, a policy
    that TSA has determined to be necessary for maintaining
    aviation security.
    To be sure, Section 1540.109 also covers conduct more
    aggressive or actively disruptive than Ramsingh’s. For
    instance, the regulation’s preamble cites “[p]revious instances”
    of “verbal abuse of screeners by passengers[.]” 67 Fed. Reg.
    at 8,344. In Rendon, the petitioner behaved in a “loud and
    belligerent” manner at a checkpoint, yelling profanities at the
    TSA officer. 
    424 F.3d at 477, 479
    . Similarly, in In the Matter
    of John Brennan, 12-TSA-0092 (Sept. 18, 2014), aff’d 691 F.
    App’x 332 (9th Cir. 2017), when Brennan tested positive for
    explosives, he stripped naked at the checkpoint and refused to
    put his clothes back on, requiring TSA employees to close the
    checkpoint and move bins around to block the public’s view,
    
    id.
     at 1–2.
    Ramsingh did not physically assault or threaten anyone,
    yell, use profanity, behave in a belligerent manner, or remove
    his clothing. Nor did his resistance to the pat-down necessitate
    closing the checkpoint or cause delays in the screening of other
    passengers at that checkpoint. But even acknowledging
    Ramsingh’s more mild-mannered behavior, TSA reasonably
    concluded that Ramsingh nonetheless prevented TSA officers
    from completing their required screening duties. That was the
    crux of the interference findings in Rendon and Brennan, and
    was at the heart of the finding of interference by the TSA here.
    See Rendon, 
    424 F.3d at 479
     (holding that, whatever Rendon’s
    First Amendment interests, he directly “interfered with the
    screener’s duty to both thoroughly screen passengers and to do
    13
    so in an efficient manner”); Brennan, 12-TSA-0092, at 3
    (concluding that Brennan “presented an actual hindrance to the
    [officers’] ability to conduct secondary screening and resolve
    the [explosive trace detection] alarm”).
    So too here, while Ramsingh remained relatively calm and
    composed throughout the entire encounter, he prevented TSA
    personnel from conducting a full-body pat-down in response to
    a positive explosives alarm and from enforcing the agency’s
    security policy prohibiting individuals from backing out of
    screening midway.3
    Ramsingh argues that he merely engaged in “passive non-
    compliance,” which, “without more, [is] insufficient to
    constitute interference.” Ramsingh Opening Br. 13. In
    support, he points to District of Columbia v. Little, 
    339 U.S. 1
    (1950). In Little, a District of Columbia regulation made it a
    misdemeanor to “interfer[e] with or prevent[] any inspect[or]”
    from examining a building reported to be in an unsanitary
    condition. 
    Id.
     at 4–5 (citation omitted). The Supreme Court
    held that the “regulation [could] not fairly be interpreted to
    encompass” Little’s “failure to unlock her door and her
    remonstrances on constitutional grounds[,]” 
    id. at 7
    , noting that
    the regulation did not “impose any duty on home owners to
    assist health officers to enter and inspect their homes[,]” 
    id. at 6
    .
    That case, interpreting a different regulation in the
    constitutionally sensitive context of a governmental entry into
    the home, is of no help to Ramsingh. For one, Little involved
    a criminal offense, whereas Section 1540.109 imposes only a
    3
    Ramsingh does not rely on the medical basis for his
    noncompliance in this first part of his argument about the proper
    meaning of “interference” in 
    49 C.F.R. § 1540.109
    .
    14
    civil penalty. Even more relevantly, Ramsingh’s interference
    involved his failure to adhere to required processes in a highly
    regulated public area into which he voluntarily entered with
    full notice that he could be subjected to search procedures,
    including a pat-down. Cf. Little, 
    339 U.S. at 7
     (“The right to
    privacy in the home holds too high a place in our system of
    laws to justify a statutory interpretation that would impose a
    criminal punishment on one who does nothing more than
    [Little] did here.”) (emphasis added).
    Ramsingh, in other words, “affirmatively refused to”
    complete the screening process at a TSA checkpoint that he
    freely chose to enter, and he asserted no constitutional
    objection to the pat-down at the time. United States v.
    Willfong, 
    274 F.3d 1297
    , 1299, 1302 (9th Cir. 2001) (rejecting
    analogy to Little when a logger was charged with “interfering
    with [a] forest officer engaged in * * * the performance of his
    official duties[,]” after “affirmatively refus[ing] to discontinue
    logging on Forest Service land when ordered to do so by a
    forest officer”) (citation omitted).
    2
    TSA’s reading of “interfere” also comports with the
    regulation’s history and purpose. Section 1540.109 was
    promulgated in the aftermath of the September 11th attacks and
    in response to a congressional demand for “increased air
    transportation security measures.” 67 Fed. Reg. at 8,340. The
    preamble to the final rule explains that Section 1540.109 is
    written to broadly prohibit any action that poses a risk of
    “distract[ing] or inhibit[ing] a screener from effectively
    performing his or her duties.” Id. at 8,344. The preamble
    further explains that:
    A screener encountering such a situation must
    turn away from his or her normal duties to deal
    15
    with the disruptive individual, which may affect
    the screening of other individuals.          The
    disruptive individual may be attempting to
    discourage the screener from being as thorough
    as required. The screener may also need to
    summon a checkpoint screening supervisor and
    law enforcement officer, taking them away
    from other duties. Checkpoint disruptions
    potentially can be dangerous in these situations.
    This rule supports screeners’ efforts to be
    thorough and helps prevent individuals from
    unduly interfering with the screening process.
    Id.
    As a consequence of Ramsingh’s noncompliance with
    screening procedures, a Transportation Security Officer, three
    Supervisory Transportation Security Officers, and the on-duty
    Transportation Security Manager had to “turn away from
    [their] normal duties” for approximately 20 minutes. 67 Fed.
    Reg. at 8,344. In addition, both the Federal Security Director
    and Assistant Federal Security Director for the entire Tampa
    International Airport were involved, diverting their attention
    from other important matters. Most importantly, TSA was
    unable to conduct the “thorough” screening of Ramsingh that
    it has deemed necessary for airport safety, or to enforce its
    security policy that those who choose to enter a screening area
    are required to complete the screening process. Id.
    In short, Ramsingh’s conduct objectively interfered with
    TSA operations in multiple respects, presenting the type of
    aviation security concerns addressed by the regulation’s
    prohibition on interference.
    16
    B
    Ramsingh also contends that the TSA erred because
    specific intent is required to violate the regulation. Ramsingh
    is incorrect.
    First, the regulation is silent as to mens rea. See 
    49 C.F.R. § 1540.109
    . So TSA’s decision was consistent with the
    regulatory text.
    Second, while silence on mens rea is not dispositive for
    criminal statutes, Staples v. United States, 
    511 U.S. 600
    , 606
    (1994), here we are dealing with a civil penalty for the violation
    of an administrative regulation. And not just any regulation,
    but one designed to promote the public safety and welfare. The
    regulation’s primary purpose is not to punish wrongdoers, but
    to protect the safety of passengers, airline personnel, and the
    public more broadly by ensuring that all individuals are
    thoroughly screened before being permitted into the secure area
    of an airport. While interfering with TSA screening personnel
    in the performance of their duties may not result in any “direct
    or immediate injury to person or property” in a particular case,
    it “create[s] the danger or probability of” someone being able
    to sneak a weapon or other dangerous item onto an aircraft, an
    obvious safety and security risk “which the [regulation] seeks
    to minimize.” Morissette v. United States, 
    342 U.S. 246
    , 256
    (1952); see also Federal Express Corp. v. Department of
    Commerce, No. 20-5337, slip op. at 24–25 n.5, 27 (D.C. Cir.
    July 8, 2022).
    When construing statutes dealing with public welfare or
    regulatory offenses, courts “have inferred from silence that
    Congress did not intend to require proof of mens rea to
    establish an offense[,]” Staples, 
    511 U.S. at 606
    , and we can
    make the same type of inference here. See Morissette, 324 U.S.
    at 256 (“[L]egislation applicable to such [public welfare]
    17
    offenses, as a matter of policy, does not specify intent as a
    necessary element[,]” because “whatever the intent of the
    violator, the injury is the same[.]”). Given that Section
    1540.109 is a public welfare regulation “meant to protect the
    safety and security of the flying public[,]” A. 299–300, TSA
    had no obligation to find specific intent on Ramsingh’s part.
    Ramsingh objects that TSA’s interpretation would
    produce untenable results, such as fining a passenger who
    “accidentally drops a bin and delays an x-ray line,” or “who
    spills a bottle of liquid requiring a lane to close for clean-up[.]”
    Ramsingh Opening Br. 22.
    That argument confuses specific intent (i.e., intent to
    interfere with TSA screening personnel in the performance of
    their duties) with general intent (i.e., intent to engage in the
    conduct that causes the interference). See 1 WAYNE R.
    LAFAVE, SUBSTANTIVE CRIMINAL LAW § 5.2(e) (3d ed. 2018)
    (General intent requires “at least an intention to make the
    bodily movement which constitutes the act which the [offense]
    requires[,]” whereas specific intent is used “to designate a
    special mental element which is required above and beyond
    any mental state required with respect to the actus reus of the
    [offense].”).
    We do not understand TSA to have held that no general
    intent is required to violate Section 1540.109—merely that no
    specific intent is required. See A. 298–299 (discussing
    Morissette, public welfare offenses, and “the levels of intent”).
    And Ramsingh’s actions satisfy any general intent
    requirement. While the traveler who accidentally drops a bin
    cannot be said to have intended to do so, the record shows that
    Ramsingh intended to refuse compliance with the pat-down
    requirement.
    18
    C
    Next, Ramsingh asserts that, as applied to him, Section
    1540.109 is unconstitutionally vague. Not so.
    An enactment violates the Due Process Clause if it is “so
    vague that it fails to give ordinary people fair notice of the
    conduct it punishes, or so standardless that it invites arbitrary
    enforcement.” Beckles v. United States, 
    137 S. Ct. 886
    , 892
    (2017) (citation omitted); see also United States v. Bronstein,
    
    849 F.3d 1101
    , 1107 (D.C. Cir. 2017) (An enactment is
    “unconstitutionally vague if, applying the rules for interpreting
    legal texts, its meaning specifies no standard of conduct at all.”)
    (formatting modified and citation omitted). In applying this
    rule, the law has “greater tolerance of enactments with civil
    rather than criminal penalties because the consequences of
    imprecision are qualitatively less severe.” Village of Hoffman
    Estates v. Flipside, Hoffman Estates, Inc., 
    455 U.S. 489
    , 498–
    499 (1982).
    Ramsingh posits several hypotheticals in which he claims
    travelers would lack fair notice that they “interfere[d]” with
    security personnel, within the meaning of Section 1540.109.
    For instance, Ramsingh asks whether a passenger who tells a
    joke to a screener or forgets to remove his or her belt before
    approaching the metal detector will have sufficiently distracted
    a screener to be held liable under Section 1540.109.
    But imagining scenarios in which application of the
    regulation might be impermissibly vague is of no help to
    Ramsingh because an individual “who engages in some
    conduct that is clearly proscribed cannot complain of the
    vagueness of the law as applied to the conduct of others.”
    Hoffman Estates, 
    455 U.S. at 495
    . Especially so because
    Ramsingh explicitly characterizes his vagueness argument as
    19
    an as-applied, rather than facial, challenge. See Ramsingh
    Reply Br. 14.
    Ramsingh’s burden instead is to show that the regulation
    is unconstitutionally vague as applied to the facts of his case.
    He cannot do that.
    TSA regulations, in combination with publicly posted
    guidance, give fair notice that failure to comply with required
    screening procedures, which can include a pat-down, will
    constitute prohibited interference. See 
    49 C.F.R. § 1540.107
    (a)
    (“No individual may enter a sterile area or board an aircraft
    without submitting to the screening and inspection of his or her
    person[.]”); 
    id.
     § 1542.201(b) (“Each airport operator [is]
    required to * * * [p]ost signs at secured area access points and
    on the perimeter that provide warning of the prohibition against
    unauthorized      entry.”);    Security     Screening,     TSA,
    https://www.tsa.gov/travel/security-screening (last accessed
    July 7, 2022) (“Pat-Down Screening” drop-down box) (“You
    may be required to undergo a pat-down procedure if the
    screening technology alarms, as part of unpredictable security
    measures, for enhanced screening, or as an alternative to other
    types of screening, such as advanced imaging technology
    screening.”).    Because Ramsingh’s conduct is “clearly
    proscribed” by the regulation, his as-applied vagueness
    challenge fails. Hoffman Estates, 
    455 U.S. at 495
    ; see also
    Rendon, 
    424 F.3d at 480
     (rejecting vagueness challenge to
    Section 1540.109); Brennan, 691 F. App’x at 332–333 (same).
    V
    Lastly, Ramsingh insists that, even if noncompliance
    generally can qualify as interference under Section 1540.109,
    noncompliance grounded in medical reasons cannot. More
    specifically, Ramsingh contends that (i) his medical inability to
    comply rendered his actions non-volitional, and (ii) imposing a
    20
    fine given his medical conditions violates substantive due
    process. Neither argument succeeds.
    A
    A foundational element of “[t]he general rule of both civil
    and criminal responsibility is that a person is not liable for a
    harm done unless he caused it by his action (actus reus)[.]”
    Western Fuels-Utah, Inc. v. Federal Mine Safety & Health Rev.
    Comm’n, 
    870 F.2d 711
    , 713 (D.C. Cir. 1989). The TSA found
    that Ramsingh engaged in two volitional acts that support his
    culpability: (1) electing to enter the security checkpoint and
    begin the screening process knowing he may be subject to a
    pat-down, and (2) refusing to be patted down and to complete
    the screening process. The TSA was wrong as to the first but
    not the second.
    Certainly the first act—entering the screening area and
    initiating screening—was a voluntary act. But it does not by
    itself support his liability. Nothing about merely approaching
    a TSA checkpoint and presenting yourself and your
    possessions for inspection violates Section 1540.109.
    The second act identified by TSA, however, was both
    volitional and violated Section 1540.109. Ramsingh explained
    that he considered his options to be (1) allow TSA to conduct
    the pat-down in public, (2) allow TSA to conduct the pat-down
    in private, (3) run from the checkpoint, or (4) continue to refuse
    and ask for law enforcement. He deliberately chose the fourth
    option. And that choice contravened the regulation because
    Ramsingh’s refusal to submit to a full-body pat-down
    prevented TSA officers from carrying out their mandatory
    screening duties. See 
    49 C.F.R. § 1540.109
    .
    Ramsingh argues that his refusal was not volitional
    because, “for medical reasons, he was unable to comply.”
    21
    Ramsingh Opening Br. 24. But Ramsingh specifically
    admitted in the administrative proceedings that he “refused” to
    comply with the pat-down requirement.            A. 108–109.
    Whatever his reasons for noncompliance, that refusal, which
    he selected from among various available courses of action,
    satisfies the volitional-act requirement.
    B
    Ramsingh next argues that if his medical inability to
    comply does not excuse his interference, then the regulation is
    “sufficiently shocking of the conscience to rise to the level of a
    deprivation of substantive due process rights.” Ramsingh
    Opening Br. 12. That is incorrect.
    To violate substantive due process, governmental action
    must be “so egregious, so outrageous, that it may fairly be said
    to shock the contemporary conscience.” County of Sacramento
    v. Lewis, 
    523 U.S. 833
    , 847 n.8 (1998). Not every unfortunate
    or regrettable event amounts to a substantive due process
    violation. “[O]nly the most egregious official conduct can be
    said to be ‘arbitrary in the constitutional sense[.]’” 
    Id. at 846
    (quoting Collins v. City of Harker Heights, 
    503 U.S. 115
    , 129
    (1992)). Given that demanding standard, TSA’s imposition of
    a $680 fine for Ramsingh’s noncompliance with required
    screening procedures—even if the reason for that
    noncompliance was his Post-Traumatic Stress Disorder and
    Military Sexual Trauma—did not infringe Ramsingh’s
    substantive due process rights.
    While deliberate indifference to medical needs can violate
    substantive due process, Lewis, 
    523 U.S. at
    849–850, the TSA
    officers did not exhibit such callousness to Ramsingh’s medical
    conditions. They allowed him to go through a metal detector
    rather than the AIT machine due to his shoulder injury. The
    pat-down was necessitated by Ramsingh’s hand-swipe testing
    22
    positive for explosive residue. When Ramsingh explained his
    discomfort with a pat-down, TSA offered to conduct the search
    in a more private area. While the accommodations provided
    did not fully meet Ramsingh’s medical needs, the TSA officers
    made a good-faith effort to respect his particular conditions
    while also performing their security and public-safety duties.
    In sum, on this record, TSA’s conduct did not approach the
    level of egregiousness or outrageousness needed to establish a
    violation of substantive due process.4
    VI
    For all those reasons, we deny Ramsingh’s petition for
    review.
    So ordered.
    4
    We note that Ramsingh did not raise, either before the agency
    or this court, a claim under the Rehabilitation Act, 
    29 U.S.C. § 794
    ,
    or any other claim alleging that TSA discriminated against him on
    the basis of disability. So neither the TSA nor we have had any
    occasion to address whether TSA’s decision comports with federal
    disability law.