36 CFR 1150.13 : Parks, Forests, And Public Property (§ 1.1 To Parts 1601-1699) — (Parts 300-311 To Parts 1601-1699) — Architectural And Transportation Barriers Compliance Board (Parts 1100-1119 To Parts 1195-1199) — Practice And Procedures For Compliance Hearings (§ 1150.1 To § 1150.114) — Parties, Complainants, Participants (§ 1150.11 To § 1150.14) — Participation on petition.

(a) By petitioning the judge, any person may be permitted to participate in the proceedings when he/she claims an interest in the proceedings and may contribute materially to their proper disposition. A complainant shall be permitted to participate in the proceeding when he/she petitions the judge.

(b) The judge may, in his/her discretion, determine the extent of participation of petitioners, including as an intervening party or participant. The judge may, in his/her discretion, limit participation to submitting documents and briefs, or permit the introduction of evidence and questioning of witnesses.