40 CFR Part 1610

4 sections.

§ 1610.1
Representation of witnesses in investigations
§ 1610.2
Repeated attorney misconduct, sanctions, hearings
§ 1610.3
Sequestration of witnesses and exclusion of Counsel
§ 1610.4
Deposition Transcripts

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.