CFR›Title 49›Subtitle B›Chapter I›49 CFR Part 199 Citation49 CFR Part 199ContainsSubparts Subpart A–Subpart CCorpusDaily eCFRDisplayed edition2026-09-24Last updated2026-09-24 PART 199—DRUG AND ALCOHOL TESTING Subparts Subpart A Subpart A—General Subpart B Subpart B—Drug Testing Subpart C Subpart C—Alcohol Misuse Prevention Program Authority49 U.S.C. 5103, 60102, 60104, 60108, 60117, and 60118; 49 CFR 1.53.Source53 FR 47096, Nov. 21, 1988, unless otherwise noted.