Salem Hospital Corp. v. National Labor Relations Board , 808 F.3d 59 ( 2015 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued September 22, 2015         Decided December 15, 2015
    No. 11-1466
    SALEM HOSPITAL CORPORATION, DOING BUSINESS AS
    MEMORIAL HOSPITAL OF SALEM COUNTY,
    PETITIONER
    v.
    NATIONAL LABOR RELATIONS BOARD,
    RESPONDENT
    HEALTH PROFESSIONALS AND ALLIED EMPLOYEES,
    AFT/AFL-CIO,
    INTERVENOR
    Consolidated with 12-1009
    On Petition for Review and Cross-Application
    for Enforcement of an Order
    of the National Labor Relations Board
    Kaitlin A. Kaseta argued the cause for the petitioner.
    Bryan T. Carmody was on brief.
    Don T. Carmody entered an appearance.
    Kellie Isbell, Attorney, National Labor Relations Board,
    argued the cause for the respondent. John H. Ferguson,
    2
    Associate General Counsel, Linda Dreeben, Deputy Associate
    General Counsel, and Julie B. Broido, Supervisory Attorney,
    were with her on brief.
    David Strom, Sam Lieberman and Lisa Leshinski were on
    brief for the intervenor Health Professionals and Allied
    Employees, AFT/AFL-CIO, in support of the respondent.
    Before: HENDERSON, MILLETT and WILKINS, Circuit
    Judges.
    Opinion for the Court filed by Circuit Judge HENDERSON.
    KAREN LECRAFT HENDERSON, Circuit Judge: Salem
    Hospital Corporation (Salem) petitions for review of the
    National Labor Relations Board’s (Board) certification of a
    bargaining unit and its subsequent determination that Salem
    unlawfully refused to bargain. The thrust of Salem’s petition
    is that the Board’s misapplication of its own adjudicatory
    procedures denied Salem a fair opportunity to contest the
    bargaining unit’s certification.      Although the Board’s
    proceedings are indeed gaffe-ridden, Salem has failed to
    establish that it was prejudiced thereby. For the reasons set
    forth below, we deny Salem’s petition for review and grant the
    Board’s cross-application for enforcement.
    I. BACKGROUND
    Section 7 of the National Labor Relations Act (NLRA or
    Act) provides that employees may “form, join, or assist labor
    organizations, to bargain collectively through representatives
    of their own choosing, and to engage in other concerted
    activities for the purpose of collective bargaining.” 
    29 U.S.C. § 157
    . An election held to determine whether a union is
    entitled to represent a group of employees—i.e., a
    3
    representation election—must be conducted in “ ‘laboratory
    conditions[,]’ free from coercion” from employer and union
    alike. See SSC Mystic Operating Co. v. NLRB, 
    801 F.3d 302
    ,
    309 (D.C. Cir. 2015) (citing 
    29 U.S.C. § 158
    (a)(1), (b)(1)(A)
    (prohibiting employer and union from “interfer[ing] with,
    restrain[ing], or coerc[ing] employees in the exercise” of their
    collective bargaining rights)).
    Particularly relevant here, an employee who acts as a
    supervisor does not have section 7 rights. 1 And, like the
    employer and the union, he may not interfere with an
    employee’s exercise of section 7 rights. See SSC Mystic, 801
    F.3d at 309. If a “supervisor’s conduct reasonably tend[s] to
    have such a coercive effect on the employees that it [is] likely
    to impair their freedoms of choice in the election,” the Board
    finds “supervisory taint.” See Harborside Healthcare, Inc.,
    
    343 N.L.R.B. 906
    , 908 (2004). Supervisory taint affecting a
    petition for a representation election can result in the dismissal
    of the petition. See Nat’l Labor Relations Bd. Casehandling
    Manual, Pt. 2, Representation Proceedings (Manual)
    § 11730.3(a) (2014); see also id. § 11028.2; SSC Mystic, 801
    F.3d at 310.
    The Act also charges the Board with determining an
    appropriate collective bargaining unit. 
    29 U.S.C. § 159
    (b).
    Pursuant to this duty, the Board investigates a petition filed by
    the employees (or a labor organization acting on their behalf),
    1
    The Act defines a supervisor as “any individual having
    authority, in the interest of the employer, to hire, transfer, suspend,
    lay off, recall, promote, discharge, assign, reward, or discipline other
    employees, or responsibly to direct them, or to adjust their
    grievances, or effectively to recommend such action, if in
    connection with the foregoing the exercise of such authority is not of
    a merely routine or clerical nature, but requires the use of
    independent judgment.” 
    29 U.S.C. § 152
    (11).
    4
    declaring that they “wish to be represented for collective
    bargaining and that their employer declines to recognize their
    representative.” 
    Id.
     § 159(b). An employer can agree to
    conduct an election and resolve disputes after the fact, see 
    29 C.F.R. § 102.62
    ,2 but if a petition is filed and no agreement is
    reached, a Board Regional Director (RD) sets a “representation
    hearing” to determine if the petition concerns a “unit
    appropriate for the purpose of collective bargaining.” 
    Id.
    § 102.67(a). The hearing officer (HO) does not render a
    decision; rather, his duty is to “inquire fully into all matters and
    issues necessary to obtain a full and complete record upon
    which the Board or the [RD] may discharge their duties.” Id.
    § 102.64(a) (emphasis in original).
    The Federal Rules of Evidence are not “controlling” in a
    representation hearing, 
    29 C.F.R. § 102.66
    (a); see also Manual
    § 11216, but by regulation the Board has set forth detailed
    procedures.      For example, all parties “have the right
    to . . . examine, and cross-examine witnesses, and to introduce
    into the record documentary and other evidence.” 
    29 C.F.R. § 102.66
    (a). In addition, the HO “shall, on the written
    application of any party, forthwith issue subpoenas requiring
    the attendance and testimony of witnesses and the production
    of any evidence . . . under their control.” 
    Id.
     § 102.66(c);
    accord 
    29 U.S.C. § 161
    (1). Based on the record the HO
    assembles, the RD may “direct an election, dismiss the
    petition, or make other disposition of the matter.” 
    29 C.F.R. § 102.67
    (a). The RD’s decision is appealable to the Board.
    
    Id.
     § 102.67(b).
    2
    Unless otherwise indicated, all citations to the Code of
    Federal Regulations refer to the version in effect at the time the
    described events took place.
    5
    When an election is held and it produces no objections, the
    RD issues “a certification of the results of the election,
    including certification of representative where appropriate.”
    Id. § 102.69(b). If objections to the election are filed, the RD
    may dispose of them via an “administrative investigation” if
    they do not “raise substantial and material factual issues,” id.
    § 102.69(d); see also Manual § 11395.1; otherwise a hearing is
    set before another HO to determine their merit. 
    29 C.F.R. § 102.69
    (d). 3 If a hearing is held, the presiding officer
    (whether HO or ALJ) issues a “report resolving questions of
    credibility and containing findings of fact and
    recommendations as to the disposition of the issues.” 
    Id.
    § 102.69(e). The parties may thereafter file “exceptions” to
    the report, id., which exceptions the Board may ultimately
    review. Id. §§ 102.69(f), 102.67(c). Once this procedure
    runs its course, the Board may certify the union but a
    certification is generally not immediately judicially
    reviewable. See, e.g., Hartz Mountain Corp. v. Dotson, 
    727 F.2d 1308
    , 1310–11 (D.C. Cir. 1984). To obtain judicial
    review of the certification, an employer can decline to bargain
    with the certified union, which declination then produces a
    ULP complaint.4 See 
    29 U.S.C. §§ 158
    (a)(5), 160(f). The
    3
    If there is simultaneously pending an unfair labor practices
    (ULP) proceeding, the RD “may consolidate the [representation]
    hearing . . . before an administrative law judge” instead of an HO.
    
    29 C.F.R. § 102.69
    (c)(1)(ii) (2015); 
    id.
     § 102.33(a), (c) (2010).
    4
    Although the Board’s General Counsel (GC) exercises
    ultimate authority over the prosecution of a ULP complaint, see 
    29 U.S.C. § 153
    (d), the RD plays a substantial role in the process. For
    example, the ULP charge is generally filed with the RD of the region
    in which the alleged ULP has occurred or is occurring. 
    29 C.F.R. § 102.10
    . The RD then investigates to determine whether a
    complaint should issue. The investigation may be “as simple as
    ascertaining whether certain statements were made . . . . [o]r, the
    case may be as complex as ascertaining whether the parties’ overall
    6
    Board’s handling—and, at times, mishandling—of its layered
    procedure forms the heart of this case.
    Salem is an acute-care facility located in Salem, New
    Jersey. On May 19, 2010, Health Professionals and Allied
    Employees AFT, AFL-CIO (HPAE or Union) filed an election
    petition with the Board to represent Salem’s registered nurses.
    The proposed unit included charge nurses (CNs), who, Salem
    maintained, were supervisors and thus ineligible for
    representation under the Act. A representation hearing before
    an HO began on June 2, 2010, to create the record on which the
    RD was to determine the CNs’ status and the appropriateness
    of the proposed bargaining unit.
    While the representation hearing was underway, Salem
    filed a ULP charge against HPAE alleging supervisory taint
    resulting from the involvement of two alleged supervisory CNs
    in the filing of the petition. Upon receiving the charge, the
    RD began a second process to resolve the taint dispute: Salem
    was directed to provide the RD with evidence regarding the
    CNs’ alleged involvement in the filing, while the record
    conduct over the course of protracted contract negotiations violated
    [the Act].” See Nat’l Labor Relations Bd. Casehandling Manual,
    Pt. 1, Unfair Labor Practice Proceedings § 10050 (2015). The
    charging party must, inter alia, meet with Board agents and comply
    with any reasonable request necessary to complete the investigation.
    See id. § 10054.1. If the charging party delays presentation of
    evidence without cause, the charge is “subject to dismissal for lack
    of cooperation.” Id. If the charging party’s evidence presents a
    “prima facie case,” the charged party “should be contacted to
    provide additional and more complete evidence.”               See id.
    § 10054.4. The RD issues a complaint if “it appears . . . that formal
    proceedings in respect [of the charge] should be instituted” and sets a
    hearing before an administrative law judge (ALJ). 
    29 C.F.R. § 102.15
    . At this point, the GC prosecutes the complaint.
    7
    regarding the predicate CN supervisory status question was yet
    to be completed by the HO conducting the representation
    hearing.
    Over a one-week period, June 2–9, 2010, witnesses for
    both Salem and the Union testified at the representation
    hearing. Two complications arose. First, Salem moved to
    transfer the proceeding to another regional office, alleging that
    the HO had engaged in ex parte communications with certain
    CN witnesses. The motion was denied, first by the HO and,
    ultimately, by the GC. Second, Salem requested that the HO
    prepare subpoenas for certain witnesses. Although the HO
    confirmed that the subpoenas would be prepared, see
    Representation Hr’g Tr. at 807 (“[Salem’s Counsel] has
    requested some subpoenas. They are being prepared.”), he
    closed the record on the following day over Salem’s objection.
    The RD’s concurrent investigation of Salem’s supervisory
    taint charge also proved troublesome. Salem missed multiple
    deadlines to produce witnesses for RD interviews. Moreover,
    the affidavit evidence it submitted to the RD was deemed
    insufficient. See Reg’l Dir.’s Letter of Dismissal 1 (“Even
    assuming that these charge nurses are supervisors within the
    meaning of . . . the Act, there is insufficient evidence to
    establish that the charge nurses’ limited prounion activities
    coerced employees in the exercise of their Section 7 rights.”).
    The RD then closed the investigation and declined to issue a
    complaint. Salem appealed the RD’s decision to the GC but
    its appeal was denied. See Gen. Counsel’s Denial of Hosp.’s
    Appeal of Reg’l Dir.’s Refusal to Issue Compl.
    On August 2, 2010, using the HO’s record from the
    representation hearing, the RD issued her decision regarding
    8
    the CNs’ supervisory status. She concluded that all but two5
    of Salem’s CNs were not supervisors and issued a “direction of
    election.” The election took place on September 1–2, 2010.
    Salem challenged the RD’s election order, arguing, inter alia,
    that the HO’s record closure was premature, repeating its
    allegation of ex parte communications between the HO and
    CN witnesses and claiming that the alleged supervisors tainted
    the election petition.      The Board denied the petition,
    concluding that Salem raised no issues warranting review.
    Thereafter, the election results were released and revealed that
    the Union won 73–48.
    Salem next moved the RD to set aside the election results,
    raising 20 objections. Objections 1–16 tracked the events
    leading up to the election, that is, Salem’s supervisory taint
    charge and the proceedings resulting in the determination that
    the CNs were not supervisors. Objections 18–20 involved
    allegations of impropriety that occurred during the election.6
    On January 10, 20117 the RD set a hearing before an HO to
    resolve the objections. The case was then consolidated with a
    pending ULP proceeding initiated by the Union and set to be
    heard by an ALJ on February 22.8
    5
    The RD excluded the two nurses from the bargaining unit.
    See Reg’l Dir.’s Decision and Direction of Election at 23 n.12.
    6
    On December 30, 2010, Salem abandoned Objection 17 by
    letter to the RD.
    7
    All subsequent dates occurred in 2011 unless otherwise
    noted.
    8
    The consolidation occurred because there was a pending
    ULP complaint against Salem based on charges the Union made. It
    withdrew the charges before the hearing began. See Union’s Mot.
    for Special Permission to Appeal at 2 n.5; Salem Hosp. Corp., &
    Health Prof’ls & Allied Emps., JD-14-11, 
    2011 WL 1043489
     (Mar.
    9
    On February 15, the Union filed a “request for special
    permission to appeal” (Special Appeal) with the Board,
    arguing that Salem’s Objections 1–16 had already been
    decided and urging the Board to reverse the RD’s decision
    setting a hearing thereon. Seven days later—before Salem
    responded and on the same day the ALJ began the
    representation hearing—the Board granted the Special Appeal
    and reversed the RD’s decision. Salem filed its response to
    the Union’s Special Appeal with the Board later that same day.
    Although the Board overturned the RD’s decision to set a
    hearing on Objections 1–16, it remanded the Objections to the
    RD for disposition. The RD administratively dismissed them
    on February 24. Before the ALJ reached the merits of the
    remaining Objections, Salem made two separate filings with
    the Board. First, Salem moved for reconsideration of the
    Board’s grant of the Union’s Special Appeal, arguing that its
    regulations did not allow for the procedure and that, assuming
    they did, Salem was, at a minimum, entitled to respond.
    Second, Salem appealed the RD’s administrative dismissal of
    Objections 1–16. Before the Board ruled on either motion,
    the ALJ found against Salem on Objections 18–20 and
    23, 2011). It is, however, unclear whether Board procedure was
    followed when the ALJ continued to hear the representation case.
    Board rules direct that an HO conduct a hearing on objections to an
    election. 
    29 C.F.R. § 102.69
    (d); cf. 
    29 C.F.R. § 102.69
    (c)(1)(ii)
    (2015) (“[E]xcept that the regional director may consolidate the
    hearing concerning objections and challenges with an unfair labor
    practice proceeding before an administrative law judge.”). By the
    time the hearing set for February 22nd occurred, the ULP complaint
    had been withdrawn. The rules authorize the RD to sever a
    previously consolidated case, 
    29 C.F.R. § 102.33
    (a)(4), (c), and,
    presumably, assign the representation hearing to an HO and the ULP
    proceeding to an ALJ. Here the RD instead allowed the remaining
    representation hearing to proceed before the ALJ.
    10
    explained that he did not resolve Objections 1–16. See Salem
    Hosp. Corp., & Health Prof’ls & Allied Emps., JD-14-11, 
    2011 WL 1043489
     (Mar. 23, 2011) (“I have not treated with or
    considered in any respects [Salem’s] Objections 1–16.”).
    On April 6, Salem filed seven exceptions to the ALJ’s
    decision, arguing that he erred in declining to rule on
    Objections 1–16 and that his findings on Objections 18–20
    were wrong on the merits. On August 3, the Board9 denied
    the exceptions and certified HPAE as the exclusive collective
    bargaining representative for Salem’s registered nurses
    (including CNs).        The Board also denied Salem’s
    reconsideration motion regarding the Union’s Special Appeal.
    The Board, however, neglected to dispose of Salem’s appeal of
    the RD’s administrative dismissal of Objections 1–16.
    Salem then refused to recognize or bargain with HPAE
    and, on September 14, the GC filed a ULP complaint alleging
    9
    Although it is unclear from the record, Salem claims that it
    “filed with the Board timely Exceptions to [the ALJ’s] decision,”
    Pet’r Br. at 14 (emphasis added); Employer’s Br. in Sup. of its
    Exceptions to the Rec. Dec. of Administrative Law Judge Earl E.
    Shamwell, Jr., at 1, and indeed, the Board ruled on them.
    Parenthetically, the rules now direct that exceptions to a
    post-election representation hearing order must be filed with, and
    ruled on by, the RD. 
    29 C.F.R. § 102.69
    (c)(iii) (2015) (“Any party
    may, within 14 days of the issuance of such report, file with the
    regional director . . . exceptions to such report . . . . . The regional
    director shall thereupon decide the matter upon the record or make
    other disposition of the case.”). An appeal may then be taken to the
    Board.      
    Id.
     § 102.69(c)(2) (“The decision of the regional
    director . . . shall be final unless a request for review is granted [by
    the Board].”). Granted, exceptions to an ALJ’s ULP ruling are filed
    directly with the Board, id.; 
    29 C.F.R. § 102.46
     (2015), but the
    Union had dropped its ULP complaint, see supra n.8.
    11
    that “[o]n or about August 17, Respondent, by letter of [CEO],
    notified the Union that it refused to recognize and bargain with
    the Union as the exclusive collective bargaining representative
    of the Unit.” Complaint and Notice of Hearing, Case
    04-CA-064455 at 2. Salem conceded its refusal but raised as
    “affirmative defenses” many of the alleged improprieties that
    plagued the earlier proceedings—specifically, that: (1) the
    Board should have sustained Salem’s objections to the
    election; (2) the Board should not have granted the Union’s
    Special Appeal; (3) the GC should have transferred the
    representation hearing to another HO; (4) the GC should have
    issued a complaint in connection with Salem’s supervisory
    taint charge; and (5) the Board impermissibly failed to rule on
    Salem’s appeal of the RD’s dismissal of Objections 1–16.
    An ALJ hearing was scheduled for December 14, but, on
    October 12, the GC moved for summary judgment before the
    Board. See 
    29 C.F.R. § 102.24
    (a) (summary judgment
    motion is to be filed with Board). Before ruling on the
    motion, the Board issued an “erratum” amending its August 3rd
    certification order. The one-page order acknowledged the
    Board’s failure to resolve Salem’s appeal of the RD’s
    dismissal of Salem’s Objections 1–16 and purported to deny it
    nunc pro tunc. Finally, on November 29 the Board granted
    the GC’s motion for summary judgment on the ULP
    complaint, concluding that all of Salem’s defenses either
    were—or could have been—litigated in the earlier
    proceedings. Salem Hosp. Corp., 
    357 NLRB No. 119
    , 
    2011 WL 5976073
     at *1 & n.5 (2011) (citing Pittsburgh Plate Glass
    Co. v. NLRB, 
    313 U.S. 146
    , 162 (1941)).
    Salem timely petitioned for review of the Board’s
    November 29 order and the Board cross-applied for
    enforcement. Our jurisdiction is based on 
    29 U.S.C. § 160
    (e),
    (f).
    12
    II. ANALYSIS
    Salem’s several challenges focus, at bottom, on the
    Board’s faulty adherence to its procedure.10 Our review is for
    abuse of discretion, see Canadian Am. Oil Co. v. NLRB, 
    82 F.3d 469
    , 473–76 (D.C. Cir. 1996) (reviewing challenged
    procedural steps), and Salem must show that “prejudice
    resulted from” the Board’s lapses. Desert Hosp. v. NLRB, 
    91 F.3d 187
    , 190 (D.C. Cir. 1996). This it fails to do. Our
    analysis is informed by the significant deference we accord the
    Board’s determination of an appropriate bargaining unit,
    reversing only if the certification is “arbitrary and without
    substantial evidence.” Cleveland Constr., Inc. v. NLRB, 
    44 F.3d 1010
    , 1014 (D.C. Cir. 1995).
    A. CLOSING REPRESENTATION HEARING RECORD
    First, Salem challenges the HO’s closure of the record
    before Salem could present evidence supporting its claim
    regarding the CNs’ supervisory taint. The NLRA is largely
    silent on the gathering and presentation of evidence at a
    representation hearing but the Board has provided substantial
    guidance by regulation. For example, it is the HO’s duty to
    “inquire fully into all matters and issues necessary to obtain a
    full and complete record.” 
    29 C.F.R. § 102.64
    (a). The
    hearing itself is “investigatory, intended to make a full record
    10
    Under recent Board precedent, Salem also challenges the
    validity of the regulation—
    29 C.F.R. § 103.30
    (a)—pursuant to
    which the Union was certified. Because Salem did not press its
    argument in the proceedings before the Board, however, it is
    forfeited. See 
    29 U.S.C. § 160
    (e) (“No objection that has not been
    urged before the Board . . . . shall be considered by the court.”).
    Moreover, we reviewed the challenged regulation in San Miguel
    Hosp. Corp. v. NLRB, 
    697 F.3d 1181
     (D.C. Cir. 2012), and upheld it
    against an identical challenge.
    13
    and nonadversarial.” See Manual § 11181. Before the
    hearing closes, the HO is to ask “on the record, whether [the
    parties] have anything further to add.” See id. § 11240. And
    he “shall, on the written application of any party, forthwith
    issue subpoenas requiring the attendance and testimony of
    witnesses.” 
    29 C.F.R. § 102.66
    (c) (emphasis added); see also
    
    id.
     (“The Regional Director or the hearing officer . . . shall
    forthwith grant the subpoenas requested.”).11
    The HO’s premature closing of the record was without
    explanation.    One day after announcing that Salem’s
    requested subpoenas would issue, he closed the record over
    Salem’s objection. Granted, the HO apparently agreed with
    the Union that Salem’s requested witnesses were cumulative12
    11
    The NLRA contains a similar provision. See 
    29 U.S.C. § 161
    (1) (Board “shall upon application of any party to such
    proceedings, forthwith issue to such party subp[o]enas requiring the
    attendance and testimony of witnesses”). The Board may revoke a
    subpoena only if “in its opinion the evidence whose production is
    required does not relate to any matter under investigation, or any
    matter in question in such proceedings, or if in its opinion such
    subp[o]ena does not describe with sufficient particularity the
    evidence whose production is required.”          
    Id.
        In Drukker
    Communications v. NLRB, 
    700 F.2d 727
     (D.C. Cir. 1983), we
    recognized two grounds (“unwarranted interference with First
    Amendment rights,” 
    id. at 730
    , and whether production would “harm
    the public interest,” 
    id. at 731
    ) for revoking a subpoena but
    concluded that, in the absence of an express or implied ground,
    revocation amounts to agency action “without observance of
    procedure required by law.” 
    Id. at 734
    ; see also 
    5 U.S.C. § 706
    (2)(D). Salem does not argue that closing the record also
    violated the statute.
    12
    The Union argued that “[t]his testimony is cumulative or
    repetitive . . . we would just object and ask that the testimony be
    limited.”        Representation Hr’g Tr. at 915.           The HO
    14
    but that inference is hardly ineluctable. According to the
    record, the HO stated only that “the Employer and the
    Petitioner have had an opportunity to discuss the supervisory
    status of the charge nurses” and that he was “not going to take
    additional testimony.” Representation Hr’g Tr. at 916. In
    her decision on the CNs’ supervisory status, the RD also failed
    to explain the HO’s failure to issue the subpoenas.
    Notwithstanding this misstep, the record does not indicate
    that Salem sought to introduce relevant, non-cumulative
    evidence and, without that, we cannot find that Salem was
    prejudiced. See Reno Hilton Resorts v. NLRB, 
    196 F.3d 1275
    ,
    1285 n.10 (D.C. Cir. 1999) (no abuse of discretion where
    excluded evidence would not “compel or persuade to a
    contrary result” (quoting Cooley v. FERC, 
    843 F.2d 1464
    ,
    1473 (D.C. Cir. 1988))); cf. Ozark Auto. Distribs., Inc. v.
    NLRB, 
    779 F.3d 576
    , 580–81 (D.C. Cir. 2015) (vacating
    decision to exclude evidence that was non-cumulative and
    critical to employer’s defense). At the hearing, Salem simply
    asserted that it had “additional witnesses who will be probative
    of the . . . supervisory status of charge nurses” and that it
    intended to go “through the same kind of questioning of those
    witnesses as [it] did with [its previous] witnesses and as the
    Union ha[d] done with their witnesses. It would concern the
    testimony of [the] Union’s witnesses and embellishment of
    that position and testimony.” Representation Hr’g Tr. at 914
    (emphasis added).13
    contemporaneously “rule[d] that [he would] not allow any additional
    testimony.” 
    Id.
    13
    In its brief, Salem claims that the “Union voiced no
    objection to the Hospital’s desire to offer further evidence.” Pet’r
    Br. at 25–26. But, as we noted, see supra n.12, that is not true. In
    addition, although the record is unclear, we note that Salem’s
    15
    In any event, the Board’s determination of the CNs’
    non-supervisory status is supported by substantial evidence.
    The RD made detailed findings14 based on the representation
    hearing record and her reasoning sufficed to support her
    determination regarding the CNs’ non-supervisory status. See
    Reg’l Dir.’s Decision and Direction of Election. Further, the
    Board finds against supervisory status if there is conflicting
    evidence in the record, see Phelps Cmty. Med. Ctr., 
    295 NLRB 486
    , 490 (1989) (“[W]henever the evidence is in conflict or
    otherwise inconclusive on particular indicia of supervisory
    counsel apparently requested the subpoenas as a delaying tactic to
    prevent the HO’s closing the record. After the HO predicted that
    the hearing would conclude within one day, Salem’s counsel
    asserted: “Not if I have anything to do with it. Request for
    subpoenas, the issuance of subpoenas.” Representation Hr’g Tr. at
    805. If this is so, it is indeed regrettable. We have previously
    noted the sharp practice of Salem’s counsel in proceedings before us
    and do so again here in an effort to stop its repetition. See San
    Miguel Hosp. Corp., 697 F.3d at 1188 (“As we noted at the outset,
    the Hospital unleashed a blizzard of arguments to challenge the
    Board’s unfair-labor-practice orders. It might be appropriate to
    suggest that in appellate argument, the proverbial rifle is preferable
    to a machine gun—but that would assume petitioner had at least a
    few good arguments; it did not. In truth, it appears to us that all the
    Hospital sought was the inevitable delay that review of Board orders
    affords.”).
    14
    See Reg’l Dir.’s Decision and Direction of Election at 17
    (finding Salem CNs assign nurses to patients but process “does not
    involve independent judgment” and nurses “generally meet and
    decide among themselves which nurse should care for which
    patient”); id. at 19 (finding Salem CNs direct aides to perform some
    rudimentary tasks but “any nurse, not only a CN, may request that
    aides perform such functions” and “assignment of [these] basic tasks
    [does not] require[] independent judgment.”); id. at 20 (only
    disciplinary authority CNs have is to issue “written warning”).
    16
    authority, we will find that supervisory status has not been
    established.”), and that is what it did here. See Reg’l Dir.’s
    Decision and Direction of Election at 17 n.11 (“At best,
    [Salem] can argue that the evidence is in conflict as to whether
    the CNs [exercise supervisory authority]. The Board will not
    find supervisory status in the face of such a conflict.”).
    Nonetheless, Salem contends that the excluded testimony
    would have resolved conflicting evidence tending to show
    non-supervisory status.15 We do not see how, by introducing
    more conflicting testimony, Salem could have solved the
    evidentiary conflict.
    Salem relies on our Ozark decision to argue that parties
    have a right to present all relevant evidence during a
    representation hearing. But Ozark involved substantially
    different facts. There, the employer challenged the Board’s
    certification because four of its employees allegedly “acted as
    agents of the union.” Ozark, 779 F.3d at 580. In a
    post-election objection hearing, the employer served
    subpoenas duces tecum on the union and on an employee who,
    according to the employer, had acted as a union agent. Id. at
    578. Both the union and the employee objected to the
    subpoenas on the grounds of overbreadth and privilege. Id.
    After reserving her ruling on the subpoenas, the HO eventually
    granted the union’s and the employee’s motions to revoke the
    subpoenas without examining the documents the employer
    sought. Id. at 578–79. We found that the HO’s revocation
    action violated Board procedure. Id. at 581–82. The Board’s
    Guide for Hearing Officers in Representation Proceedings
    “state[d] that when confidentiality or other objections are
    raised to oppose a subpoena . . . the hearing officer should
    15
    See Pet’r. Br. at 25 (arguing its witnesses would testify
    that, based on their everyday working relationship with CNs, patient
    assignment was “hardly ‘collaborative’ ”).
    17
    consider receiving the material in camera and reviewing the
    documents to determine whether redacting certain information
    or narrowing the scope of the subpoena might cure the
    objection.” Id. at 582. We concluded that the procedural
    flaw prejudiced the employer because establishing that
    employees acted as union agents was critical to the employer’s
    defense; in addition, the HO’s delay in ruling on the subpoenas
    increased the prejudice to the employer because, had the
    employer known earlier that the subpoenas would be quashed,
    it could have “alter[ed] its presentation . . . . All trial lawyers
    know the danger of the unknown.” Id.
    We are not persuaded by Salem’s attempt to align its case
    with Ozark. In Ozark we found prejudice based on both the
    relevant and non-cumulative nature of the evidence sought to
    be presented and the delay in ruling, which exposed the
    employer to uncertainty in establishing its defense. Id. at
    582–83. By contrast, because Salem failed either to make a
    proffer or to provide any other specific evidence of potential
    witnesses’ testimony,16 we cannot determine that the excluded
    evidence was either relevant or material.
    16
    At oral argument Salem’s counsel contended that its
    proffer was made orally, see Oral Arg. Recording at 3:30 (“Counsel
    for the hospital explicitly references the house supervisors and the
    need, in light of the evidence elicited by the Union . . . to put on the
    house supervisors to explain their duties and also to explain the
    illogical position being taken during testimony by the charge
    nurses.”); see also Representation Hr’g Tr. at 914–15 (“[I]t would be
    the house supervisors” and “it would concern the testimony of [the]
    Union’s witnesses and embellishment of that position and
    testimony.”). To the extent we can consider the foregoing a proffer,
    it hardly tells us what the witnesses would testify to, much less how
    their testimony could “persuade to a contrary result,” Reno Hilton
    Resorts, 
    196 F.3d at
    1285 n.10, given the Board’s practice of finding
    18
    In sum, despite the Board’s unexplained failure to allow a
    party to submit evidence at a representation hearing, Salem has
    not, as it must, established prejudice. Accordingly, we
    conclude that the HO’s premature closing of the record was not
    an abuse of discretion.
    B. FAILURE TO TRANSFER FOR ALLEGED EX PARTE
    COMMUNICATIONS
    Salem next challenges the GC’s failure, on review from
    the HO’s similar failure, to transfer the representation hearing
    to another region in light of the alleged ex parte
    communications. The Board’s regulations prohibit ex parte
    communications.         
    29 C.F.R. § 102.126
    (b) (“No Board
    agent . . . participating in [relevant proceedings], shall . . .
    make or knowingly cause to be made any prohibited ex parte
    communications about the proceeding to any interested person
    outside this agency relevant to the merits of the proceeding.”).
    Board regulations also grant the GC power to transfer the case
    “in order to effectuate the purposes of the [NLRA].” 
    Id.
    § 102.33(a).
    The GC’s failure to transfer was reasonable under the
    circumstances. Salem did not make specific allegations of ex
    parte communications, see Gen. Counsel’s Denial of Hosp.’s
    Mot. to Transfer at 2 (July 27, 2010) (“Initially, outside of
    unsubstantiated claims, your communication references no
    evidence of such ex parte meetings.”), and the GC’s own
    investigation found that “neither the Hearing Officer nor his
    supervisor engaged in any.” Id. In fact, the “Hearing
    Officer’s contact with the Employer’s nurses, except for an
    against supervisory status if there is conflicting evidence.   See
    Phelps Cmty. Med. Ctr., 295 NLRB at 490.
    19
    occasional pleasantry, was limited to those times when they
    were testifying on the record.” Id.
    Salem faults the GC for failing to request its evidence of
    ex parte communications but cites no regulation or policy that
    requires the GC to affirmatively seek evidence. Moreover,
    Salem had the opportunity to present its evidence, both in its
    petition for transfer before the GC and in its earlier motion
    before the HO. But the petition contained only conclusory
    assertions, see Salem’s Mot. to Transfer at 1 n.1 (“It was
    apparent during the hearing (specifically on June 4, 2010)
    that . . . [the HO] had met privately with the Union’s two
    attorneys and at least [one CN] . . . regarding various issues
    related to the petition.”), and the same was true at the hearing.
    See Representation Hr’g Tr. at 618 (“I would imagine that
    there are Board agents . . . who are bound by certain ethical
    consideration, in terms of meeting with a supervisor of this
    Employer in my absence. And I just want the Regional Office
    to understand, if that is something which is in play here . . . I
    would recommend that serious thought be given to whether or
    not to modify that behavior.”).
    In any event, Salem does not claim that it was prejudiced
    by the decision not to transfer.          Indeed, “ex parte
    communications, even when undisclosed during agency
    proceedings, do not necessarily void an agency decision.”
    Prof’l Air Traffic Controllers Org. v. FLRA, 
    685 F.2d 547
    , 564
    (D.C. Cir. 1982). Rather, a party must show that “as a result
    of improper ex parte communications, the agency’s
    decisionmaking process was irrevocably tainted.”            
    Id.
    Because Salem has not shown prejudice, we conclude that
    neither the HO nor the GC abused his discretion.17
    17
    In its brief Salem argued that the alleged ex parte
    communications meant that the HO had prejudged the CNs’ status.
    20
    C. UNION’S SPECIAL APPEAL
    Salem makes two arguments regarding the Union’s
    Special Appeal of the RD’s decision to set a hearing on
    Salem’s Objections 1–16. First, Salem asserts that no Board
    rule permits such an appeal. Second, it objects to the Board’s
    failure, in any event, to allow Salem to respond. The Board’s
    errors are not insignificant but, again, prejudice to Salem is
    lacking.
    The Special Appeal was undoubtedly unauthorized. The
    Union relied on 
    29 C.F.R. § 102.26
     to press its Special Appeal
    but that rule governs appeals in unfair labor practices
    proceedings. The Board asserts that another rule—
    29 C.F.R. § 102.65
    (c)—permits the appeal. Even if the Board is correct,
    it misapplied the rule here.
    At the time the Union made its Special Appeal, Section
    102.65(c) provided that
    Requests to the regional director, or to the
    Board in appropriate cases, for special
    permission to appeal from a ruling of the
    hearing officer, together with the appeal from
    such ruling, shall be filed promptly, in writing,
    Its argument does not support a prejudice finding given that the
    RD—not the HO—makes the status determination. See 
    29 C.F.R. § 102.67
     (directing that RD, not HO, render a decision). Salem also
    argued that, in order to protect the HO, the RD had an improper
    incentive to find no supervisory status. We reject this conclusory
    assertion. Cf. Withrow v. Larkin, 
    421 U.S. 35
    , 55 (1975) (“Without
    a showing to the contrary, [government actors] are assumed to be
    men of conscience and intellectual discipline, capable of judging a
    particular controversy fairly on the basis of its own circumstances.”)
    (internal quotations omitted).
    21
    and shall briefly state (1) the reasons special
    permission should be granted and (2) the
    grounds relied on for the appeal. . . . Any
    statement in opposition or other response to the
    request and/or to the appeal shall be filed
    promptly.
    (emphasis added). 18 Section 102.65(c) gave the Board
    considerable discretion in its implementation, viz., special
    appeals to the Board were permitted “in appropriate cases.”
    
    29 C.F.R. § 102.65
    (c). But the Board could not explain at oral
    argument why this was an “appropriate case,” see Oral Arg.
    Recording at 23:34–25:15 (“I do not think it is
    unprecedented . . . . I could try to find out for you.”). 19
    Moreover, the Board’s interpretation of “filed promptly” here
    is inconsistent at best. The Board heard the Union’s Special
    Appeal even though it was filed more than one month after the
    RD decision setting a hearing. If the Union’s filing was
    prompt, then Salem’s response within one week was
    alacritous. Yet the Board gave one party over one month to
    18
    The highlighted language has since been deleted.
    Section 102.65(c) now provides: “Requests to the regional director
    for special permission to appeal from a ruling of the hearing officer,
    together with the appeal from such ruling, shall be filed promptly, in
    writing, and shall briefly state the reasons special permission should
    be granted and the grounds relied on for the appeal. . . . Any
    statement in opposition or other response to the request and/or to the
    appeal shall be filed promptly, in writing, and shall be served
    immediately on the other parties and on the regional director.”
    19
    If not unprecedented, the Board has apparently expanded
    the scope of section 102.65(c) by allowing special appeals from an
    RD decision although special appeals were (and are) limited to “a
    ruling of the hearing officer.” 
    29 C.F.R. § 102.65
    (c); see also 
    29 C.F.R. § 102.65
    (c) (2015).
    22
    file without allowing the other side so much as a week to
    respond.
    Nonetheless, Salem once again cannot establish that the
    Board’s mistake prejudiced it. Salem asserts that, by granting
    the Union’s Special Appeal and reversing the RD’s decision
    setting a hearing, it was stripped of its ability to argue the
    merits of Objections 1–16 to the ALJ. Although true, Salem
    was not prejudiced thereby for at least three reasons. First,
    Objections 1–16 related to the CNs’ supervisory status, an
    issue that had already been litigated before the Board. Even if
    Salem were allowed to make its arguments to the ALJ, we see
    no reason that the ALJ would have reached a conclusion
    contrary to that of the Board. Second, if Salem were for some
    reason successful before the ALJ, the Board reviews his
    decisions and the Board had already determined that Salem’s
    objections constituted prohibited relitigation.20 Finally, if the
    procedural error did prejudice Salem, the prejudice was cured
    when the Board considered Salem’s motion for
    reconsideration. Before certifying the Union, the Board
    reconsidered its earlier order—this time with the benefit of
    Salem’s response—and reached the same conclusion.
    D. BOARD’S “ERRATUM” ORDER
    Salem next questions the propriety of the Board’s
    Erratum, which redressed the latter’s failure to timely rule on
    20
    See 
    29 C.F.R. § 102.69
    (d) (directing that hearing be held
    only if there are “substantial and material factual issues”). The
    Union argued that Objections 1–16 did not meet this requirement
    because they were already “decided by the RD in the [decision and
    direction of election], concerning which review was denied by the
    Board,” Union’s Mot. for Special Permission to Appeal at 2, and the
    Board agreed. See NLRB Order Granting Mot. for Special
    Permission to Appeal at 2.
    23
    Salem’s appeal of the RD’s administrative dismissal of
    Objections 1–16. But the Board had already determined that
    Salem’s Objections 1–16 were meritless. It did so both when
    it denied Salem’s petition for review of the RD’s direction of
    election and when it granted the Union’s Special Appeal.
    Salem does not explain how the Board’s issuance of the
    erratum was ultra vires or how the order prejudiced it.
    E. BOARD’S DENIAL OF SALEM’S DEFENSE TO ULP
    CHARGE
    Salem’s final salvo is that the Board prevented it from
    litigating supervisory taint as a defense to the ULP charge.
    We do not see how Salem could establish taint without
    relitigating the predicate supervisory question but it
    nonetheless maintains that the Board should have permitted it
    to make the argument as a defense in the ULP proceeding.
    Board regulations generally prohibit—in ULP
    proceedings—relitigation of matters that arose at the earlier
    representation proceeding stage. See 
    29 C.F.R. § 102.67
    (f)
    (“[This rule] shall preclude . . . parties from relitigating, in any
    related subsequent unfair labor practice proceeding, any issue
    which was, or could have been, raised in the representation
    proceeding.” (emphasis added)). We have upheld the rule,
    see Pace Univ. v. NLRB, 
    514 F.3d 19
    , 23–24 (D.C. Cir. 2008),
    and only limited exceptions apply. For example, relitigation
    is allowed if newly discovered evidence requires
    reexamination of the representation decision. See Joseph T.
    Ryerson & Sons, Inc. v. NLRB, 
    216 F.3d 1146
    , 1151 (D.C. Cir.
    2000) (“It is well established that in the absence of newly
    discovered evidence or other special circumstances requiring
    reexamination of the decision in the representation proceeding,
    a respondent is not entitled to relitigate in a subsequent
    refusal-to-bargain proceeding representation issues that were
    24
    or could have been litigated in the prior representation
    proceeding.” (quotation omitted)).        Relitigation is also
    permitted if subsequent legal authority changes the relevant
    law. See Alois Box Co. v. NLRB, 
    216 F.3d 69
    , 78 (D.C. Cir
    2000) (“Because . . . the company failed to present legal
    authority indicating that the Board had changed its standard for
    determining supervisory status” the application of its “rule
    against relitigation” was proper).         Again, we review
    application of the Board’s no-relitigation rule for abuse of
    discretion. See Pace Univ., 514 F.3d at 24.
    The relitigation ban plainly applied to Salem. Salem had
    already raised the CNs’ supervisory status issue in the
    representation proceeding and lost. It was also unsuccessful
    in pursuing its supervisory taint charge. Salem nonetheless
    makes three arguments in favor of relitigation. First, Salem
    recycles the argument about its inability to present supervisory
    status evidence at the representation hearing. We resolved
    this issue at the representation hearing level, see supra part
    II.A, and Salem offers no reason for us to reconsider it at the
    ULP stage. Next, Salem contends that parties in ULP
    proceedings are guaranteed the right to raise affirmative
    defenses, notwithstanding the GC considered the facts
    supporting the defense in the context of a potential charge and
    declined to issue a complaint. Although Salem is correct, see
    United Food and Commercial Workers v. NLRB, 
    675 F.2d 346
    ,
    354–55 (D.C. Cir. 1982) (because “[a] party subject to an
    unfair labor practice complaint has a right to a hearing” and
    “the scope of the General Counsel's investigatory inquiry does
    not approach that of the required hearing,” GC’s consideration
    and denial of charge cannot prevent party from litigating facts
    of charge as defense in ULP proceeding), the argument gets it
    only half-way to the finish line. It removes one obstacle—the
    GC’s decision not to pursue a supervisory taint complaint—but
    leaves another undisturbed—the fact that Salem already
    25
    litigated—and lost—a question of fact essential to the defense,
    namely, the CNs’ non-supervisory status.
    Finally, Salem contends that Board precedent permits
    relitigation here, relying on Sub-Zero Freezer Co., 
    271 NLRB 47
     (1984) (allowing employer to relitigate pre-election issues
    at ULP proceeding). But, as the Board describes it, Sub-Zero
    is a limited exception. Salem Hosp. Corp., 
    357 NLRB No. 119
    , 
    2011 WL 5976073
     at *1 n.5 (“Sub-Zero is one of a limited
    number of cases in which the Board has departed from the
    [no-relitigation] rule.”). There, the Board credited allegations
    that union supporters had threatened the property and lives of
    voting employees.21 The election was also close—the union
    won by only two votes. Sub-Zero, 271 NLRB at 47. The
    Board in Sub-Zero acknowledged its departure from the
    general no-relitigation policy but explained that failure to
    make an exception there would result in an order “requiring an
    employer to bargain with a union that has not attained the
    status of majority representative from a free and fair election.”
    
    Id.
    Assuming arguendo that the Board erred by not allowing
    Salem to use the Sub-Zero exception, we believe no prejudice
    resulted therefrom. As we have explained, substantial
    evidence supports the Board’s conclusion that the CNs were
    not supervisors. In addition, Salem had failed to persuade the
    RD that the CNs engaged in any conduct resulting in
    supervisory taint even if they were in fact supervisors. We
    therefore conclude that the Board did not abuse its discretion in
    prohibiting Salem from relitigating supervisory taint.
    21
    In Sub-Zero, the Board incorporated by reference the facts
    set forth in an earlier Board decision. Sub-Zero, 271 NLRB at 47
    (citing 
    265 NLRB 1521
    , 1522–23 (1982)).
    26
    *   *    *
    The Board’s myriad missteps—its own as well as those of
    its agents—are a cause for concern and we can only hope that
    this case constitutes an exception to an otherwise robust and
    faithful adherence to the Board’s own process. See, e.g.,
    Morton v. Ruiz, 
    415 U.S. 199
    , 235 (1974) (“[I]t is incumbent
    upon agencies to follow their own procedures.”).
    For the foregoing reasons, we deny Salem’s petition for
    review and grant the Board’s cross-application for
    enforcement.
    So ordered.