43 CFR § 4.826 - Discovery.
(a) Methods. Parties may obtain discovery as provided in these rules by depositions, written interrogatories, production of documents, or other items; or by permission to enter property, for inspection and other purposes.
(b) Scope. Parties may obtain discovery regarding any matter, not privileged, which is relevant to the subject matter involved in the hearing.
(c) Protective orders. Upon motion by a party or by the person from whom discovery is sought, and for good cause shown, the administrative law judge may make any order which justice requires to limit or condition discovery in order to protect a party or person from annoyance, embarrassment, oppression, or undue burden or expense.