RegulationsTitle 49Subtitle BChapter ISubchapter DPart 199Subpart B—Drug Testing49 CFR 199.111Regulationcurrent49 CFR 199.111[Reserved]Current as of 2026-08-18 Government sourceeCFR editorial compilationAuthoritative but unofficialView source 1 passagesPrevious§ 199.109Next§ 199.113