49 C.F.R. § 32.610 Controlled substance.
Title 49 - Transportation
Controlled substance means a controlled substance in schedules I through V of the Controlled Substances Act (21 U.S.C. 812), and as further defined by regulation at 21 CFR 1308.11 through 1308.15.
Title 49: Transportation
PART 32—GOVERNMENTWIDE REQUIREMENTS FOR DRUG-FREE WORKPLACE (FINANCIAL ASSISTANCE)
Subpart F—Definitions
§ 32.610 Controlled substance.