§ 961.12 (Rule 12) Ex parte communications.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Except as described in this section, a party may not communicate with a Hearing Official or other member of the Judicial Officer Department without the other party present. Exceptions:
(a) A Hearing Official or other member of the Judicial Officer Department may talk to a party individually to discuss procedural matters.
(b) A Hearing Official may talk to a party individually when a telephone conference or hearing has been scheduled and the other party does not appear.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.