Fraternal Order of Police, Metropolitan Labor Committee v. District of Columbi , 2014 D.C. App. LEXIS 2 ( 2014 )


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    DISTRICT OF COLUMBIA COURT OF APPEALS
    No. 12-CV-351
    FRATERNAL ORDER OF POLICE, METROPOLITAN LABOR COMMITTEE, APPELLANT,
    v.
    DISTRICT OF COLUMBIA, APPELLEE.
    Appeal from the Superior Court
    of the District of Columbia
    (CAB-5152-10)
    (Hon. John Ramsey Johnson, Trial Judge)
    (Argued June 4, 2013                                   Decided January 2, 2014)
    Paul A. Fenn, with whom Erinn M. Maguire was on the brief, for appellant.
    Mary L. Wilson, Senior Assistant Attorney General, Office of the Solicitor
    General, with whom Irvin B. Nathan, Attorney General for the District of
    Columbia, Todd S. Kim, Solicitor General, and Donna M. Murasky, Deputy
    Solicitor General, were on the brief, for appellee.
    Before GLICKMAN and MCLEESE, Associate Judges, and REID, Senior Judge.
    REID, Senior Judge: This appeal arises out of a Freedom of Information Act
    (“FOIA”) request made by appellant, the Fraternal Order of Police, Metropolitan
    Police Labor Committee (“FOP”), for certain documents related to the “Intoxilyzer
    5000EN,” a device used by the Metropolitan Police Department (“MPD”) to
    2
    measure the amount of alcohol in a suspect’s breath. Appellee, the District of
    Columbia, initially denied the request on the basis of the FOIA exemption for
    “investigatory records compiled for law enforcement purposes,” set forth in D.C.
    Code § 2-534 (2010 Supp.);1 the District’s investigation related to errors in the
    1
    The investigatory records exemption is found in D.C. Code § 2-534 (a)(3):
    (a) The following matters may be exempt from
    disclosure under the provisions of this subchapter: . . .
    (3) Investigatory records compiled for law-
    enforcement purposes, including the records of Council
    investigations and investigations conducted by the Office
    of Police Complaints, but only to the extent that the
    production       of       such       records      would:
    (A) Interfere with:
    (i) Enforcement proceedings;
    (ii) Council investigations; or
    (iii) Office of Police Complaints ongoing
    investigations;
    (B) Deprive a person of a right to a fair trial or an
    impartial adjudication;
    (C) Constitute an unwarranted invasion of personal
    privacy;
    (D) Disclose the identity of a confidential source
    and, in the case of a record compiled by a law-
    enforcement authority in the course of a criminal
    investigation, or by an agency conducting a lawful
    national security intelligence investigation, confidential
    information furnished only by the confidential source;
    (E) Disclose     investigative   techniques      and
    procedures not generally known outside the government;
    or
    (continued…)
    3
    Intoxilyzer measurements that resulted in reversals of some convictions for driving
    while under the influence. In response to the denial of its FOIA request, FOP filed
    a complaint in the Superior Court against the District, alleging FOIA violations and
    seeking declaratory and injunctive relief, as well as attorneys’ fees and costs.
    Following the completion of its investigation and during the litigation proceedings,
    the District produced numerous documents and denied the request for others on
    grounds of privilege (attorney-client, deliberative process, and work product).2
    (…continued)
    (F) Endanger the life or physical safety of law-
    enforcement personnel. . . .
    2
    The provisions pertaining to the deliberative process, attorney-client and
    work product privileges are contained in D.C. Code § 2-534 (a)(4) and § 2-534 (e):
    (4) Inter-agency or intra-agency memorandums or
    letters, including memorandums or letters generated or
    received by the staff or members of the Council, which
    would not be available by law to a party other than a
    public body in litigation with the public body . . .
    (e) All exemptions available under this section shall
    apply to the Council as well as agencies of the District
    government. The deliberative process privilege, the
    attorney work-product privilege, and the attorney-client
    privilege are incorporated under the inter-agency
    memoranda exemption listed in subsection (a)(4) of this
    section, and these privileges, among other privileges that
    may be found by the court, shall extend to any public
    body     that    is   subject    to   this    subchapter.
    4
    Despite numerous issues presented in the trial court by the parties, the court
    narrowed the issue to the District’s initial denial of FOP’s document request. FOP
    appeals the trial court’s rejection of its challenge to the District’s initial denial of
    its request under the investigatory records exemption; and in response to the
    District’s argument that the case is moot, FOP continues to preserve its trial court
    argument regarding the adequacy of the District’s subsequent FOIA disclosures.
    First, we hold that the case is not moot because the trial court has not
    determined whether the District sustained its FOIA burden by disclosing all of the
    requested documents to which FOP is entitled. Second, we conclude that FOP has
    not forfeited its challenge to the adequacy of the disclosures that the District made
    subsequent to its initial response to FOP. Third, we hold that the trial court erred
    by granting the District’s motion for summary judgment. Accordingly, for the
    reasons stated below, we vacate the trial court’s order and remand this case for
    further proceedings consistent with this opinion.
    FACTUAL SUMMARY
    Relevant background for this appeal reveals that in addition to this FOIA
    case concerning MPD’s use of the Intoxilyzer 5000EN to determine whether
    5
    persons who had been stopped by police officers were driving while under the
    influence of or impaired by alcohol, civil cases pertaining to allegedly erroneous
    breathalyzer readings were proceeding through the federal district court for the
    District of Columbia. At various times during the first half of the year 2010,
    approximately twenty persons sued the District of Columbia and MPD Officer
    Kelvin King in federal district court, alleging constitutional violations due to their
    convictions for driving while intoxicated (“DWI”).              Those cases were
    consolidated. See Molina-Aviles v. District of Columbia, 
    824 F. Supp. 2d 4
    , 5 n.1
    (D.D.C. 2011).
    The consolidated federal case showed that Officer King, head of MPD’s
    Impaired Driver Support Unit, was “responsible for calibrating the breath test
    machines and testing them for accuracy.” 
    Id. at 6.
    He had been assigned that
    responsibility for several years.3 The plaintiffs alleged that they were convicted
    due to incorrect Intoxilyzer readings, and they averred that the District had
    announced on February 26, 2010, its awareness of “a potential problem with the
    accuracy of the [Intoxilyzer] machines.” 
    Id. at 7-8.
    The convictions of most of the
    3
    The responsibility for calibration and testing initially had been assigned to
    the Office of the Medical Examiner, but around February 2007, the responsibility
    was delegated to MPD’s Impaired Driver Support Unit. 
    Molina-Aviles, supra
    , 824
    F. Supp. 2d at 6-7 & n.5.
    6
    plaintiffs were vacated or dismissed in the Superior Court. On November 14,
    2011, the district court denied Officer King’s motion to dismiss, without prejudice.
    
    Id. at 6.
    At some point prior to the FOIA request in this case, MPD hired a consultant,
    Ilmar Paegle, to assist with the breathalyzer program. Mr. Paegle determined that
    the Intoxilyzer was giving inaccurate readings. In response to the controversy
    concerning the accuracy of the Intoxilyzer readings MPD opened an investigation,
    focusing on Officer King, and FOP sought documents relating to the Intoxilyzer.4
    FOP submitted its FOIA request to MPD and the Office of the Chief
    Technology Officer (“OCTO”) on April 21, 2010. FOP asked for nine categories
    of materials, and its letter specifically referenced Officer King:
    1.   Any and all documents from October 1, 2008 to
    April 1, 2010, related to any quality control
    problems, and or calibration problems with the
    Intoxilyzer 5000EN[] utilized by the Metropolitan
    Police Department.
    4
    The investigation concluded with a finding of insufficient evidence to
    sustain any allegations of misconduct against any MPD officer. The report
    recommended that MPD develop “best calibration procedures” for the Intoxilyzer,
    as well as a program to train its personnel in those procedures.
    7
    2.   Any and all documents sent from the [MPD] to the
    District of Columbia’s Attorney[] General[’s] Office
    related to any quality control problems, and or
    calibration problems with the Intoxilyzer 5000EN[]
    utilized by the [MPD] from October 1, 2008 to April
    1, 2010.
    3.   Any and all documents, emails, and attachments sent
    or received, from Assistant Chief Patrick Burke’s
    [MPD] email address [] from October 1, 2008 to
    April 1, 2010, relevant to the [MPD] Intoxilyzer
    5000EN.
    4.   Any and all documents, emails, and attachments sent
    or received, from Assistant Chief Patrick Burke’s
    [MPD] email address [] from October 1, 2008 to
    April 1, 2010, related and relevant to any quality
    control problems, and or calibration problems with
    the MPD’s Intoxilyzer 5000EN.
    5.   Any and all documents, emails, and attachments sent
    or received, from Assistant Chief Patrick Burke’s
    [MPD] email address [] or any member of his staff,
    to the Office of the Attorney General[’s] Office,
    related and relevant to any quality control problems,
    and or calibration problems with the MPD’s
    Intoxilyzer 5000EN from October 1, 2008 to April
    1, 2010.
    6.   Any and all documents, emails and attachments sent
    or received from Mr. James Austrich’s [MPD] email
    address [] from October 1, 2008 to April 1, 2010,
    related to any quality control problems with the
    Intoxilyzer 5000EN.
    7.   Any and all documents, emails and attachments sent
    or received from Mr. Ilmar Paegle’s [MPD] email
    address [] from October 1, 2008 to April 1, 2010,
    related to any quality control problems, and or
    calibration problems with the MPD’s Intoxilyzer
    5000EN.
    8.   Any and all documents, emails and attachments sent
    or received BETWEEN Mr. Ilmar Paegle’s [MPD]
    email address [] AND Assistant Chief Patrick
    8
    Burke’s [MPD] email address [] from October 1,
    2008 to April 1, 2010.
    9.    Any and all documents, emails and attachments sent
    or received BETWEEN Mr. Ilmar Paegle’s [MPD]
    email address AND Officer Kelvin King’s [MPD]
    email address [] from October 1, 2008 to April 1,
    2010.
    Natasha Cenatus, MPD’s FOIA officer, sent FOP’s FOIA request to MPD’s
    Homeland Security Bureau and MPD’s Internal Affairs Bureau.             She also
    contacted the FOIA liaison person in both of those Bureaus, Traci Dean and
    Carnelia Austin, respectively. Ms. Dean informed Ms. Cenatus that Assistant
    Chief Burke, Mr. Paegle, James Austrich, and Officer King, the persons
    specifically mentioned in the FOIA request, were searching their “computer hard
    drive[s], archived e-mail files, paper files and any other records located in or
    around their office[s],” for responsive documents.      Ms. Austin advised Ms.
    Cenatus that persons in Internal Affairs were conducting a search “for any
    investigative documents related to [FOP’s] FOIA request.” Subsequently, Ms.
    Austin reported that “the investigation concerning the Intoxilyzer 5000EN and the
    employees [named in the FOIA request] was still an open investigation and . . . no
    information could be released to the public until the investigation was completed
    and closed.”     On May 11, 2010, the day after she received word that the
    9
    investigation was ongoing, Ms. Cenatus prepared a denial letter to FOP and a
    “Vaughn Index.”
    In her May 11 letter to FOP denying its FOIA request, Ms. Cenatus stated,
    in pertinent part:   “Unfortunately, your request for records maintained by the
    [MPD] is denied pursuant to D.C. Code [§] 2-534 (a)(3): See Vaughn Index
    attached.”5   The Vaughn Index comprised one page.              That page referenced
    “documents/emails related to Intoxilyzer 5000EN,” dated “October 2, 2008 – April
    1, 2010.” The documents were classified as “Confidential.” The Vaughn Index
    also listed the FOIA statutory exemptions by subsection, and an “X” had been
    placed on the line designating “(a)(3).” The following narrative was the last entry
    on the Vaughn Index: “D.C. Code 2-534(a)(3)(A): ‘This information is currently
    under an ongoing investigation with the [MPD]’s Internal Affairs. This document
    contains records compiled for law-enforcement purposes and such disclosures
    would interfere with enforcement proceedings, [C]ouncil investigations, OPC
    5
    Prior to the salutation of the District’s letter, the subject was identified as
    an “FOIA Request for information related to quality control problems and/or
    calibration problems with the MPD Intoxilyzer 5000EN . . .,” but the first sentence
    of the letter stated: “This is to inform you that we received your Freedom of
    Information Act requesting [sic] data or audio recording of the shot spotter
    device.” The reference to the “shot spotter device” appears to be an inadvertent
    error.
    10
    ongoing investigations.’” The May 11 letter also stated: “Please know that, under
    D.C. Official Code § 2-537 and 1 DCMR 412, you have the right to appeal this
    letter to the Mayor or the Superior [C]ourt of the District of Columbia.” The
    District’s May 11 response to FOP’s FOIA request fell within the statutory
    response time.6
    Approximately two months after receiving the May 11 letter, FOP filed a
    complaint against the District in the Superior Court. The July 12, 2010, complaint
    asked the trial court to: (1) “declare that the [District’s] failure to adequately
    respond to the FOIA [r]equest submitted by the [FOP] is unlawful, arbitrary and
    capricious”; (2) “compel the [District] to produce any and all of the information
    requested through the FOIA [r]equest . . . within fourteen (14) days of an [o]rder
    signed by [the trial] [c]ourt”; and (3) “award to the [FOP] its attorneys’ fees and
    costs associated with this action in accordance with D.C. Code . . . § 2-537 (c). . ..”
    The District answered FOP’s complaint on October 15, 2010. In addition to
    its general denial, the District asserted several defenses, including the following:
    6
    D.C. Code § 2-532 (c) provides that the District shall respond to all FOIA
    requests within fifteen working days by either making the requested public records
    available or notifying the party making the request of the determination that the
    request had been denied and providing the reasons in support of that determination.
    11
    “The District is entitled to withhold documents pursuant to D.C. Code § 2-534, et
    seq.”
    On October 26, 2010, while FOP’s complaint was still pending, the District
    sent a letter to FOP, together with 119 pages of material described as “responsive
    documents,” some of which “ha[d] been redacted in order to preserve privacy
    subject to D.C. Code § 2-534(a)(2). . . .” The District also attached “a Vaughn
    Index, identifying privileged documents.” The transmittal letter concluded with
    the following statement: “As responsive documents, initially withheld due to an
    ongoing police investigation, have now been produced, we request that FOP
    stipulate to a dismissal of this case.”
    The October 26 production was augmented by a second document
    production on November 23, 2010, consisting of 139 documents and a Vaughn
    Index, identifying privileged documents.       The District asserted the following
    privileges: attorney-client, work product, and deliberative process. In response to
    FOP’s inquiry as to whether the document production was complete, the District
    stated, in part, on November 24, 2010: “We recently received additional emails
    that must be reviewed before we can state that what was produced yesterday is the
    final production in the FOIA matter.”
    12
    The FOP filed a motion for summary judgment on December 7, 2010,
    challenging the adequacy of the District’s document production. FOP also argued
    that there were deficiencies in the Vaughn indices, including the lack of affidavits
    to support the claim for exemption based on privilege.7
    During a December 10, 2010, status conference, the District announced that
    (1) it would “respond in due course” to FOP’s summary judgment motion, and (2)
    in its search for documents in other “breathalyzer cases,” conducted at the direction
    of litigation counsel, the Chief Technology Officer had produced 40,000 emails.
    The District had reviewed 8,000 of the emails, found 240 to be responsive to
    FOP’s request, and needed more time to review the remainder of the emails. On
    January 5, 2011, the District filed both its opposition to FOP’s summary judgment
    motion, and its cross-motion for summary judgment.           Thereafter, the parties
    continued to file pleadings relating to the summary judgment motions.
    7
    FOP argued, in part, that the District did not provide “any of the required
    [a]ffidavit evidence to support” its assertion of the deliberative process privilege.
    Documents withheld on the basis of the deliberative process privilege included an
    email from Michael Anzallo to Christopher Lojacono, George Dixon, Samuel
    Golway, and Richard Brady, all of MPD; the email was described as “Discussion
    between policy-makers re calibration problem and how to address it.”
    13
    On April 7, 2011, the District forwarded additional documents (871 pages of
    material) to FOP, along with a thirteen-page Vaughn Index, listing and describing
    documents, and invoking various privileges – work product, deliberative process,
    and attorney-client. At the conclusion of its cover transmittal, the District asserted:
    “Please note that this production satisfies the District’s agreement to provide to
    you additional documentation responsive to the FOP’s FOIA request and is not
    made pursuant to any requirement under the FOIA statute.”              Apparently no
    affidavits accompanied the April 7 production.8
    The trial court requested supplemental pleadings in June and July 2011,
    focusing on whether the District’s May 2010 response to FOP’s FOIA request
    violated the Act. FOP filed its supplement on June 24, 2011, challenging the
    District’s use of the investigatory records exemption. The District responded on
    July 15, 2011, justifying its reliance on the investigatory records exemption,
    8
    The District argued in its May 5, 2011, supplement to its motion for
    summary judgment that FOP was “not entitled under FOIA to any of the material
    produced on April 7, 2011, because the District fulfilled its obligations under
    FOIA with its initial response to FOP on May 11, 2010,” and “[t]he only reason
    [FOP] is receiving any additional documents at all is because (1) [FOP] made its
    FOIA request concurrent with the Breathalyzer litigation, a series of lawsuits
    regarding similar subject matter; and (2) upon review of documents collected for
    the Breathalyzer litigation, counsel have discovered documents that are responsive
    to [FOP’s] FOIA request.” The District said the same was true regarding its
    October and November document productions.
    14
    reiterating its subsequent document production, and claiming that the case was
    now moot. FOP’s July 26, 2011, response again (1) contended that the District
    resorted to an impermissible assertion of a blanket exemption, stated that the
    District’s response to the FOIA request was untimely and the October, November,
    and April document productions were immaterial to the initial denial of FOP’s
    request, and (2) characterized the District’s mootness argument as “frivolous”
    because, as of June 16, 2011, the District admitted that it had not produced all
    responsive documents. Furthermore, FOP asserted, “even if the production were
    complete, which it is not, the District’s production does not address the declaratory
    relief sought through this action.”
    The court held hearings on the summary judgment issues on June 16, 2011,
    July 29, 2011, and September 23, 2011. The June 16, 2011, substantive hearing
    constituted a wide-ranging discussion of issues presented by FOP and the District,
    including the proper interpretation of the District’s FOIA statute, the privileges
    invoked by the District during its responses to FOP’s FOIA request, the necessity
    for exhausting administrative remedies, the inadequacy of the initial response, the
    deficiencies in the Vaughn Indices, the complications presented by discovery in
    other ongoing breathalyzer civil cases, and the issue of whether the District had a
    continuing obligation to produce responsive documents after the Intoxilyzer
    15
    investigation had ended. The trial court appeared most interested in the adequacy
    of the District’s initial response, whether the District wrongfully withheld
    documents when it responded on May 11, 2010, and whether the District had an
    ongoing obligation to produce documents after its initial response. The July 29,
    2011, hearing concerned a procedural matter.            The September 23, 2011,
    substantive hearing examined the alleged blanket investigatory records exemption
    claimed by the District, the completeness of the District’s document production,
    and the privileges asserted by the District in its post-May 11, 2010, transmittals.
    The trial court denied FOP’s motion for summary judgment and the
    District’s cross-motion for summary judgment on October 18, 2011. The court
    rejected the District’s assertion that FOP failed to exhaust its administrative
    remedies.   In addition, the court concluded that the issue as to whether the
    District’s “original document production was valid,” required further development
    of the record regarding whether the District claimed an impermissible “blanket
    exemption” or “a permissible ‘generic determination.’” The trial court viewed the
    blanket exemption assertion as a “critical issue” that should be decided by the
    “trier of fact.” The District filed a partial consent motion for reconsideration in
    November 2011, and FOP filed a motion for reconsideration.
    16
    On February 24, 2012, the trial court denied FOP’s motion for
    reconsideration, granted the District’s motion for summary judgment, and
    dismissed FOP’s complaint. The trial court declared “that the sufficiency of the
    investigatory records exemption is a matter of law, rather than one of fact,” and
    hence, that issue could be resolved by the court. The court ruled that the District
    “submitted a valid generic determination because the [c]ourt can trace a rational
    link between ‘documents’ discussing problems and complaints with the Intoxilyzer
    and the ‘interference,’ with the progress of an ongoing investigation relating to the
    Intoxilyzer.” After referencing affidavits submitted by Assistant Chief Burke and
    Ms. Cenatus,9 and following its consideration of “the substance of the [District’s]
    response to the FOIA request,” the trial court asserted that the exemption claimed
    by the government was ‘functional,’” and that the court could “trace a rational link
    9
    In his declaration of January 5, 2011, Assistant Chief Burke stated that he
    “personally reviewed the documents listed in the two Vaughn Indices, . . . and
    marked deliberative privilege.” He further asserted that “these documents reflect
    pre-decisional deliberations among policy-makers regarding various policies,
    including the policy regarding Intoxilyzer machines.” Also included were “drafts
    of calibration and accuracy reports.” He added: “I believe that the disclosure of
    the referenced documents would seriously discourage government employees from
    communicating with the candor necessary to effectively carry out their
    responsibilities.” The declaration does not mention any of the individuals
    referenced in FOP’s document request. In her declaration of January 4, 2011, Ms.
    Cenatus said, in part, that on May 10, 2010, she “was verbally informed by Ms.
    Austin . . . that the investigation concerning the Intoxilyzer 5000EN and [Officer
    King, Mr. Paegle, Mr. Austrich, and Assistant Chief Burke] was still an open
    investigation and that no information could be released to the public until the
    investigation was completed and closed.”
    17
    between the ways in which disclosure of the requested documents would interfere
    with the District’s Intoxilyzer investigation.” The court added that “although not
    directly relevant to [its] analysis, it is worth noting that [the District] ultimately did
    continue to respond to the FOIA request upon the conclusion of the investigation
    and thereafter, even though it was not required to do so.” The court did not accept
    FOP’s argument that the District “prematurely and improperly invoked its
    exemption,” because FOP failed to “provide any evidence supporting the allegation
    that the [District] knew when the investigation would close or that the [District]
    intentionally made its FOIA response earlier in order to avoid producing the
    investigation documents after the investigation closed.” The court did not address
    the District’s mootness contention.
    ANALYSIS
    The Arguments of the Parties
    At the beginning of its argument, FOP notes that “the parties briefed
    numerous issues relating to the District’s multiple productions of documents . . . ,”
    but that “the Superior Court narrowed the consideration to the discrete issue of
    whether the District supported its initial claim to the investigatory records
    18
    exemption under the FOIA” in its response of May 11, 2010. FOP contends that
    the Superior Court improperly granted the District’s motion for summary judgment
    on the narrow issue of whether the District supported its initial claim to the
    investigatory records exemption under D.C. Code § 2-534 (a)(3)(A), and that
    “[t]he trial court erred in concluding that [the District’s] blanket assertion of the
    [investigatory] exemption was supported under the [District’s] FOIA based upon
    belated production of documents that the District provided after the initiation of
    litigation in this action, and the belated [a]ffidavits submitted by the District in
    support of their actions. . . .” FOP further insists that the District failed to: (1)
    “provide the Superior Court with a basis to infer that the disclosure of [drafts of
    calibration accuracy reports, mentioned in Assistant Chief Burke’s affidavit] would
    have interfered with any ongoing investigation” at the time it claimed the
    investigatory records exemption on May 11, 2010, (2) “engage in a document-by-
    document review,” and (3) “identify categories of documents to support a generic
    claim to the [investigatory records] exemption.” FOP claims that the District’s
    “voluntary” production of documents “that it claimed to be outside of the scope of
    the FOIA Request did not cure this . . . FOIA violation.”
    The District urges that the case is moot because the government voluntarily
    produced all non-exempt documents requested by FOP. Furthermore, the District
    19
    claims that “FOP challenges only the adequacy of MPD’s initial response to the
    FOIA request and does not challenge whether MPD’s production as a whole was
    legally adequate.” Moreover, the District argues that “FOP did not ask the court to
    resolve any disputed facts about whether production was complete or the Vaughn
    indices adequately documented the claimed exemptions and redactions.”           The
    District further maintains that FOP “does not argue on appeal [] that the law-
    enforcement exception does not apply here in light of MPD Internal Affairs’
    investigation of Officer King,” and rather, confines its argument to the assertion
    that the District “claimed the exemption ‘without a proper and complete
    explanation or any of the required backup information.’” The District supports the
    trial court’s conclusion that it “claimed a valid and ‘functional’ exemption,” based
    on its investigation about the Intoxilyzer.
    In its reply brief FOP takes issue with the District’s contention that it
    “provided all of the documents responsive to the FOIA Request”; FOP responds:
    “The District is simply incorrect.” Furthermore, FOP states that even assuming
    “the District did provide all of the responsive documents,” it did not respond
    within the fifteen-day required statutory period, and that FOP “had an absolute
    right to receive within fifteen (15) days of the District’s receipt of the FOIA
    [r]equest” the documents requested or “notification of denial of access with
    20
    explanation of ‘the reasons therefore’ and support for those reasons.”            FOP
    cautions that if this court does not follow the statutory time limit, the required 15-
    day response provision would become “meaningless,” and such a ruling “would
    discourage FOIA requests by allowing the District to embroil FOIA requestors in
    litigation before escaping liability by simply providing a tardy response.”         In
    addition, FOP argues, and reiterates its position, that neither the declaration
    provided by Assistant Chief Burke nor that submitted by Ms. Cenatus provides
    support for the District’s assertion of the investigatory records exemption. The
    Burke declaration, submitted after the District began producing documents, “is
    specifically focused on the deliberative process privilege and is utterly silent on the
    issue of investigatory records”; the Cenatus declaration “does not show that the
    District defined its documents categorically, conducted a document-by-document
    search or explained how the release of the documents would interfere with an
    investigation.”
    Legal Standards and Principles
    We now set forth the legal standards and principles that guide our analysis.
    Our review of the trial court’s grant of summary judgment to the District is de
    novo. Fraternal Order of Police v. District of Columbia, No. 12-CV-1476, 2013
    21
    D.C. App. LEXIS 779, at *8 (D.C. Nov. 7, 2013). We view the record in the light
    most favorable to the party opposing summary judgment.” 
    Id. (citation omitted).
    “Summary judgment is appropriate only when the record, including pleadings
    together with affidavits, indicates that there is no genuine issue as to any material
    fact and that the moving party is entitled to judgment as a matter of law.” District
    of Columbia v. Fraternal Order of Police, 
    75 A.3d 259
    , 266 (D.C. 2013) (quoting
    Padou v. District of Columbia, 
    29 A.3d 973
    , 980 (D.C. 2011)) (internal quotation
    marks omitted). We determine “whether the agency has sustained its burden of
    demonstrating the documents requested are exempt from disclosure under the
    FOIA.” 
    Id. (quoting Multi
    AG Media LLC v. Department of Agric., 380 U.S. App.
    D.C. 1, 4, 
    515 F.3d 1224
    , 1227 (2008)) (internal quotation marks omitted).
    Given the broad disclosure policy reflected in the District’s FOIA, we
    “construe[] [the Act] with the view toward expansion of public access and the
    minimization of costs and time delays to persons requesting information.”
    Fraternal Order of Police v. District of 
    Columbia, supra
    , 2013 D.C. App. LEXIS
    779, at *9 (citing D.C. Code § 2-531 (2012 Repl.)). “Therefore, ‘the provisions of
    the Act giving citizens the right of access are to be generously construed, while the
    statutory exemptions from disclosure are to be narrowly construed, with
    22
    ambiguities resolved in favor of disclosure.” 
    Id. at *9-10
    (quoting Riley v. Fenty, 
    7 A.3d 1014
    , 1018 (D.C. 2010)).
    Generally, a case is moot “when the issues presented are no longer ‘live’ or
    the parties lack ‘a legally cognizable interest in the outcome.’” Settlemire v.
    District of Columbia Office of Emp. Appeals, 
    898 A.2d 902
    , 904-05 (D.C. 2006)
    (citation omitted). “[W]hile an appeal is pending, an event that renders relief
    impossible or unnecessary also renders that appeal moot.” 
    Id. at 905
    (quoting
    Vaughn v. United States, 
    579 A.2d 170
    , 175 n.7 (D.C. 1990)). “In general, ‘once
    the government produces all the documents a plaintiff requests, [the] claim for
    relief under the FOIA becomes moot.” Walsh v. United States Dep’t of Veterans
    Affairs, 
    400 F.3d 535
    , 536 (7th Cir. 2005) (quoting Anderson v. United States
    Dep’t of Health & Human Servs., 
    3 F.3d 1383
    , 1384 (10th Cir. 1993) (other
    citations omitted)); Mullen v. United States Army Criminal Investigation
    Command, 1:10cv262 (JCC/TCB), 
    2010 U.S. Dist. LEXIS 58939
    , at *8 (E.D. Va.
    June 14, 2010) (where agency agreed to produce requested documents within two
    weeks, question as to whether they were withheld under the law enforcement
    exemption is moot).     However, “in instances where an agency has released
    documents, but other related issues remain unresolved, courts frequently will not
    dismiss the action as moot.” McKinley v. Federal Deposit Ins. Corp., 
    756 F. Supp. 23
    2d 105, 110 (D.D.C. 2010) (internal quotation marks and citations omitted).
    Mootness is a question of law which we review de novo. See 
    Walsh, supra
    , 400
    F.3d at 536.
    “In a FOIA case, the burden of proof is always on the agency to demonstrate
    that it has fully discharged its obligations under the FOIA.” 
    McKinley, supra
    ,
    
    2010 U.S. Dist. LEXIS 135965
    , at *6-7 (quoting Department of Justice v. Tax
    Analysts, 
    492 U.S. 136
    , 142 n.3 (1989)). Moreover, “the standard for determining
    whether a case or controversy is mooted by a defendant’s voluntary conduct is
    ‘stringent.’” Northwestern Univ. v. United States Dep’t of Agric., 
    403 F. Supp. 2d 83
    , 85 (D.D.C. 2005). Consequently, “[i]n determining mootness, the court has to
    make ‘absolutely clear that the allegedly wrongful behavior could not reasonably
    be expected to recur.’” 
    Id. (quoting Friends
    of the Earth v. Laidlaw, 
    528 U.S. 167
    ,
    189 (2000)). “The movant must also show that ‘interim relief and events have
    completely and irrevocably eradicated the effects of the alleged violation.’” 
    Id. (citation omitted).
    “The court . . . retains jurisdiction of a FOIA case if it is not
    convinced that the agency has released all nonexempt material.” 
    Id. at 86
    (citing
    Perry v. Block, 
    221 U.S. App. D.C. 347
    , 351, 
    684 F.2d 121
    , 125 (1982)).
    24
    The Investigatory Records Exemption
    The District’s FOIA exemption for investigatory records is modeled on the
    corresponding exemption in the federal FOIA, 5 U.S.C. § 552 (b)(7)(A) (2012).10
    10
    5 U.S.C. § 552 (a) sets forth the federal disclosure policies, and 5 U.S.C.
    § 552 (b) contains the statutory exemptions:
    § 552. Public information; agency rules, opinions,
    orders, records, and proceedings
    (a) Each agency shall make available to the public
    information as follows:
    ....
    (b) This section does not apply to matters that are—
    ....
    (7) records or information compiled for law enforcement
    purposes, but only to the extent that the production of
    such law enforcement records or information (A) could
    reasonably be expected to interfere with enforcement
    proceedings, (B) would deprive a person of a right to a
    fair trial or an impartial adjudication, (C) could
    reasonably be expected to constitute an unwarranted
    invasion of personal privacy, (D) could reasonably be
    expected to disclose the identity of a confidential source,
    including a State, local, or foreign agency or authority or
    any private institution which furnished information on a
    confidential basis, and, in the case of a record or
    information compiled by criminal law enforcement
    authority in the course of a criminal investigation or by
    an agency conducting a lawful national security
    intelligence investigation, information furnished by a
    (continued…)
    25
    Barry v. Washington Post Co., 
    529 A.2d 319
    , 321 (D.C. 1987). After recognizing
    that FOIA statutory exemptions must be read “narrowly” to safeguard “the strong
    public policy favoring disclosure about governmental affairs and the acts of public
    officials,” this court “h[e]ld that the phrase ‘investigatory records compiled for
    law enforcement purposes’ in exemption 3 [of the District’s FOIA] refers only to
    records prepared or assembled in the course of ‘investigations which focus directly
    on specifically alleged illegal acts, illegal acts of particular identified [persons],
    acts which could, if proved, result in civil or criminal sanctions.’” 
    Id. at 321-22
    (quoting Rural Hous. Alliance v. United States Dep’t of Agric., 
    162 U.S. App. D.C. 122
    , 130, 
    498 F.2d 73
    , 81 (1974)) (third alteration in original). Thus, to satisfy
    D.C. Code § 2-534 (a)(3)(A)(i), investigatory records compiled for law
    enforcement purposes that would interfere with enforcement proceedings, the
    District has the burden of showing: (1) the documents requested by FOP have
    been “compiled for law enforcement purposes,” and (2) disclosure of those
    (…continued)
    confidential source, (E) would disclose techniques and
    procedures for law enforcement investigations or
    prosecutions, or would disclose guidelines for law
    enforcement investigations or prosecutions if such
    disclosure could reasonably be expected to risk
    circumvention of the law, or (F) could reasonably be
    expected to endanger the life or physical safety of any
    individual. . . .
    26
    documents would “interfere with enforcement proceedings.” Bevis v. Department
    of State, 
    801 F.2d 1386
    , 1388 (D.C. Cir. 1986).
    What Congress meant by interference with enforcement proceedings was
    “the release of information in investigatory files prior to the completion of an
    actual, contemplated enforcement proceeding.” National Labor Relations Bd. v.
    Robbins Tire & Rubber Co., 
    437 U.S. 214
    , 232 (1978).            “[S]o long as the
    investigation continues to gather evidence for a possible future criminal case, and
    that case would be jeopardized by the premature release of the evidence, [the
    investigatory records exemption] applies.” Juarez v. Department of Justice, 
    518 F.3d 54
    , 59 (D.C. Cir. 2008). However, “where an agency fails to [demonstrate]
    that the . . . documents [sought] relate to any ongoing investigation or . . . would
    jeopardize any future law enforcement proceedings, [the investigatory records
    exemption] would not provide protection to the agency’s decision.” Robbins Tire
    & Rubber 
    Co., supra, at 235
    (alterations in original) (internal quotation marks and
    citation omitted).
    A “blanket exemption,” that is, “an exemption claimed for all records in a
    file simply because they are in a file,” is impermissible under the investigatory
    records exemption. Crooker v. Bureau of Alcohol, Tobacco & Firearms, 
    789 F.2d 27
    64, 66 (D.C. Cir. 1986). But, “courts [may] make generic determinations that with
    respect to particular kinds of enforcement proceedings, disclosure of particular
    kinds of investigatory records . . . would generally interfere with enforcement
    proceedings.” 
    Id. at 67
    (quoting Robbins Tire & Rubber 
    Co., supra
    , 437 U.S. at
    236) (internal quotation marks omitted).
    Under a generic approach, an agency justifies its non-disclosure of
    documents as investigatory records based on a functional category (or categories)
    that “allows the court to trace a rational link between the nature of the document
    and the alleged likely interference.” 
    Id. In that
    regard, the agency has a “three-
    fold task”; it must:   (1) “define its categories functionally,” (2) “conduct a
    document-by-document review in order to assign documents to the proper
    category,” and (3) “explain to the court how the release of each category would
    interfere with enforcement proceedings.” 
    Bevis, supra
    , 801 F.2d at 1389-90. An
    agency must sustain its burden “by identifying a pending or potential law
    enforcement proceeding or providing sufficient facts from which the likelihood of
    such a proceeding may reasonably be inferred.” Durrani v. United States Dep’t of
    Justice, 
    607 F. Supp. 2d 77
    , 90 (D.D.C. 2009) (citation omitted). “If the generic
    index submitted by the government is not sufficient to sustain the [investigatory
    records exemption], then the [trial] court may request more specific, distinct
    28
    categories so that it may more easily determine how each category might interfere
    with enforcement proceedings”; “[t]he chief characteristic of an acceptable
    taxonomy should be functionality — that is, the classification should be clear
    enough to permit a court to ascertain how each . . . category of documents, if
    disclosed, would interfere with the investigation.” Crancer v. United States Dep’t
    of Justice (In re Department of Justice), 
    999 F.2d 1302
    , 1310 (8th Cir. 1993)
    (internal quotation marks and citations omitted).
    The District’s Assertion of Mootness
    Mootness is a justiciability issue which implicates the power of the court to
    entertain the lawsuit.11 We first consider the District’s argument that this case is
    moot because the government voluntarily produced documents responsive to
    FOP’s request. The trial court did not address the question of mootness despite the
    fact that the District explicitly raised it on July 15, 2011, in its supplemental
    pleading requested by the court. In its supplemental pleading, the District stated:
    “By providing [FOP] with a complete response no later than October 26, 2010, and
    11
    Because this court is not an Article III court, the constitutional “case or
    controversy” requirement is not directly applicable to us; nevertheless, we
    generally choose to adhere to federal mootness principles. See, e.g., Saucier v.
    Countrywide Home Loans, 
    64 A.3d 428
    (D.C. 2013).
    29
    even taking into account the later, supplemental productions, the District has
    mooted the controversy.” FOP took issue in the trial court with the District’s
    assertion of mootness, arguing in its July 26, 2011, pleading that the mootness
    argument was “frivolous,” and that the case was not moot, not only because there
    remained an outstanding question as to whether the District’s document production
    was complete, but also because “even if the production were deemed complete,
    significant legal issues would still remain unresolved,” including FOP’s request for
    declaratory relief and the timeliness of the District’s response.
    On appeal, the District contends that: “Regardless of the propriety of the
    District’s original response to the FOIA request invoking a generic law
    enforcement exception to production based on the then-ongoing internal MPD
    investigation, this case is now moot because the District subsequently produced all
    requested documents,” and hence, “FOP received all the non-exempt documents it
    sought in this FOIA action.” The District further maintains that (1) a case is moot
    “even where an agency’s initial response was tardy or incomplete,” (2) “FOP’s
    ‘desire for vindication,’ a declaration that the original denial was improper, is
    ‘inadequate’ to create a live controversy and thus prevent a finding of mootness,”
    (3) its claim of mootness “‘is not overcome by [FOP’s] interest in being awarded
    attorney’s fees,’” (4) this court should not exercise its discretion under the “capable
    30
    of repetition, yet evading review” doctrine because “[t]he precise issue FOP
    presses is fact-bound, turning on the particulars of MPD’s initial response to the
    FOIA request” and because “FOP did not preserve its entitlement to ask for such
    an exercise of discretion,” and (5) “FOP did not ask the court to resolve any
    disputed facts about whether production was complete or the Vaughn indexes
    adequately documented the claimed exemptions and redactions.”
    Our review of the record satisfies us that this case is not moot. The District
    asserts that an agency’s production of all requested, non-privileged documents
    generally moots a FOIA case or controversy. See 
    Walsh, supra
    , 400 F.3d at 536.
    While that is true, the problem here is that the trial court has not determined
    whether the District has sustained its FOIA burden by disclosing all of the
    requested documents to which FOP is entitled, even though the District contended
    in the trial court that it has produced all responsive documents, and in contrast,
    FOP questioned the adequacy of the District’s production. Hence, we cannot agree
    that the case is moot.12
    12
    FOP maintains in its reply brief that the District’s initial response was
    untimely. We addressed the timeliness issue in Fraternal Order of Police v.
    District of 
    Columbia, supra
    , 2013 D.C. App. LEXIS 779, at *37-39. There, we
    rejected FOP’s timeliness argument, distinguishing between “timeliness” and
    “sufficiency.” We concluded that the District’s response was timely because it
    “responded in good faith to a FOIA request within the time prescribed by the
    (continued…)
    31
    Nor can we agree with the District’s contention that FOP has forfeited its
    challenge to the adequacy of the disclosures that the District made subsequent to its
    initial response to FOP. Not only did FOP challenge the adequacy of the District’s
    subsequent document production in the trial court, but in its reply brief on appeal
    and in response to the District’s argument concerning mootness, FOP reiterated its
    position that the District’s disclosure was inadequate. Thus, we cannot say on this
    record that FOP forfeited its challenge to the District’s subsequent document
    production.
    The Summary Judgment Motion
    We are constrained to hold that the grant of summary judgment to the
    District was improper because the trial court committed an error of law.
    Specifically, the trial court erred in determining as a matter of law that the District
    “submitted a valid generic determination” with respect to its initial response based
    on the investigatory exemption. The court based this conclusion on the Burke and
    (…continued)
    statute, enabling the requestor to seek relief in court for any perceived deficiencies
    such as the inadequacy of the agency’s search for responsive documents or the
    unavailability of a claimed exemption.” 
    Id. at *38-39.
    Here, the District’s initial
    response to FOP’s FOIA request fell within the statutory 15-day period, and hence,
    it was timely. In addition, FOP does not contend on appeal that the District acted
    in bad faith.
    32
    Cenatus declarations, and asserted that the court could “trace a rational link
    between ‘documents’ discussing problems and complaints with the Intoxilyzer and
    the ‘interference,’ with the progress of an ongoing investigation relating to the
    Intoxilyzer.”    However, the District’s May 11, 2010, letter contains only one
    substantive sentence: “Unfortunately, your request for records maintained by the
    [MPD] is denied pursuant to D.C. Code § 2-532 (a)(3):            See Vaughn Index
    attached.”      The accompanying Vaughn Index consisted of one page and the
    District did not submit any explanatory affidavits or declarations. The Vaughn
    Index     identified    the   “subject”    as    “documents/emails      related    to
    problems/complaints involved with MPD’s use of Intoxilyzer 5000EN,”
    presumably the category of documents for which the District was claiming the
    investigatory records exemption. With respect to how disclosure of this category
    of documents would interfere with law-enforcement proceedings under D.C. Code
    § 2-534 (a)(3)(A)(i), the District included one sentence: “This document contains
    records compiled for law-enforcement purposes and such disclosure would
    interfere with enforcement proceedings, [C]ouncil investigations, OPC ongoing
    investigations.”
    As we said in Fraternal Order of Police v. District of 
    Columbia, supra
    , the
    “omission [of an affidavit or declaration] was not necessarily fatal,” because “[t]he
    33
    District can satisfy its burden to provide ‘a sufficiently detailed description of what
    it is refusing to produce and why’ by including all the necessary information on a
    Vaughn Index alone”; however, “the index must supply enough information to
    enable the court to assess whether the District properly invoked the privilege.” 
    Id. 2013 D.C.
    App. LEXIS 779, at *23 (quoting Fiduccia v. Department of Justice,
    
    185 F.3d 1035
    , 1042 (9th Cir. 1999)). Here, the Vaughn Index submitted by the
    District on May 11, 2010, was insufficient because it contained only one
    conclusory statement that repeated statutory language, and that did not “enable the
    [trial] court to assess the propriety of the District’s decision to withhold the
    material.” 
    Id. at *24.
    Indeed, the Vaughn Index offered no insight into the specific
    documents that the District was withholding. While we can infer from the Vaughn
    Index     that   the   functional   category   is   “documents/emails     related    to
    problems/complaints involved with MPD’s use of Intoxilyzer 5000En,” it is not
    clear that the District “conduct[ed] a document-by-document review” to make
    certain that all documents withheld fell into that category; nor does the Vaughn
    Index “explain to the court how the release of this category of documents would
    interfere with enforcement proceedings.” 
    Bevis, supra
    , 801 F.2d at 1390.
    In reaching its conclusion that the District satisfied all of the Crooker
    requirements for a generic determination, the trial court relied on the January 2011
    34
    declarations of Assistant Chief Burke and Ms. Cenatus. The substance of the
    Burke declaration was limited to one page, made no mention of any investigation,
    and covered only the October 26 and November 23, 2010, documents for which the
    “deliberative process privilege” was asserted. Moreover, the Burke declaration
    said nothing about interference with a law-enforcement proceeding, and instead,
    stated that “the disclosure of the referenced documents would seriously discourage
    government employees from communicating with the candor necessary to
    effectively carry out their responsibilities,” an apparent effort to show that the
    deliberative privilege applied. Unlike Assistant Chief Burke, who was responsible
    for oversight of MPD’s Special Operations Division and Tactical Information
    Divisions, Ms. Cenatus as MPD’s FOIA officer had no personal knowledge about
    the Intoxilyzer or the District’s investigation, and she specifically stated in her
    declaration that she “did not personally review [documents sent to her by the
    District on August 25, 2010, and September 27, 2010] to determine which ones, if
    any, would be responsive to the FOIA search.” Under these circumstances, the
    District was not entitled to summary judgment as a matter of law.
    Furthermore, the question as to whether the District released all non-
    privileged documents after its initial denial, as it contends, presents genuine issues
    of material fact, even considering the Burke and Cenatus declarations. The Burke
    35
    and Cenatus declarations were submitted prior to the District’s April 7, 2011,
    disclosures for which it claimed various privileges. Apparently, no explanatory
    declaration was submitted with the April 7, 2011, document production, and in
    several instances for documents referenced prior to April 2011, the Index does not
    demonstrate why the documents are shielded from disclosure by privilege. For
    example, several documents generated between February and March 2010, are
    “forms” described as “draft calibration and accuracy checklist” for which the
    District asserts the deliberative process privilege, but it is not readily apparent why
    these forms implicate the deliberative process. We explained the deliberative
    process privilege in Fraternal Order of Police v. District of 
    Columbia, supra
    ,
    indicating that the information withheld under this privilege “must be both
    ‘predicisional’ and ‘deliberative,’” that is, it must have been “prepared in order to
    assist an agency decision maker in arriving at his decision,” and “reflect[] the give
    and take of consultative process.” 2013 D.C. App. LEXIS 779 at *12. The
    description of the documents as “draft calibration and accuracy checklist” does not
    “pinpoint an [MPD] decision or policy to which these [forms] contributed,” nor is
    one able to infer from the Vaughn Index that the forms were part of a consultative
    process. 
    Id. at *12-13.
                                            36
    Accordingly, because (1) the case is not moot, (2) FOP has not forfeited its
    challenge to the adequacy of the District’s disclosures subsequent to its initial
    response to FOP’s document request, and (3) the trial court improperly granted
    summary judgment to the District, we vacate the trial court’s order and remand this
    case so that the trial court may (a) consider the implications of the District’s
    subsequent document production, and (b) resolve the merits of the dispute, whether
    (i) by way of summary judgment under a proper understanding of the relevant legal
    principles or (ii) after a trial.
    So ordered.