49 C.F.R. § 219.102 Prohibition on abuse of controlled substances.
Title 49 - Transportation
No employee who performs covered service may use a controlled substance at any time, whether on duty or off duty, except as permitted by §219.103.
Title 49: Transportation
PART 219—CONTROL OF ALCOHOL AND DRUG USE
Subpart B—Prohibitions
§ 219.102 Prohibition on abuse of controlled substances.
