49 CFR §31.24

1. (a)A party or a prospective witness or deponent may file a motion for a protective order with respect to discovery sought by an opposing party or with respect to the hearing, seeking to limit the availability or disclosure of evidence.
2. (b)In issuing a protective order, the ALJ may make any order which justice requires to protect a party or person from annoyance, embarrassment, oppression, or undue burden or expense, including one or more of the following:
   1. (1)That the discovery not be had;
   2. (2)That the discovery may be had only on specified terms and conditions, including a designation of the time or place;
   3. (3)That the discovery may be had only through a method of discovery other than that requested;
   4. (4)That certain matters not be inquired into, or that the scope of discovery be limited to certain matters;
   5. (5)That discovery be conducted with no one present except persons designated by the ALJ;
   6. (6)That the contents of discovery or evidence be sealed;
   7. (7)That a deposition after being sealed be opened only by order of the ALJ;
   8. (8)That a trade secret or other confidential research, development, commercial information, or facts pertaining to any criminal investigation, proceeding, or other administrative investigation not be disclosed or be disclosed only in a designated way; or
   9. (9)That the parties simultaneously submit to the ALJ specified documents or information enclosed in sealed envelopes to be opened as directed by the ALJ.