49 C.F.R. § 199.103 Use of persons who fail or refuse a drug test.
Title 49 - Transportation
(a) An operator may not knowingly use as an employee any person who— (1) Fails a drug test required by this part and the medical review officer makes a determination under DOT Procedures; or (2) Refuses to take a drug test required by this part. (b) Paragraph (a)(1) of this section does not apply to a person who has— (1) Passed a drug test under DOT Procedures; (2) Been considered by the medical review officer in accordance with DOT Procedures and been determined by a substance abuse professional to have successfully completed required education or treatment; and (3) Not failed a drug test required by this part after returning to duty. [53 FR 47096, Nov. 21, 1988, as amended by Amdt. 199–2, 54 FR 51850, Dec. 18, 1989. Redesignated and amended by Amdt. 199–19, 66 FR 47118, Sept. 11, 2001]
Title 49: Transportation
PART 199—DRUG AND ALCOHOL TESTING
Subpart B—Drug Testing
§ 199.103 Use of persons who fail or refuse a drug test.