CFR > Title 49 > Subtitle B > Chapter VI > Part 655 > Subpart C CFR > Title 49 > Subtitle B > Chapter VI > Part 655 > Subpart C – Prohibited Drug Use Current as of: 2024 | Check for updates | Other versions § 655.21 Drug testing Ask a legal question, get an answer ASAP!Click here to chat with a lawyer about your rights.