49 C.F.R. § 219.603 Participation in drug testing.
Title 49 - Transportation
A railroad shall, under the conditions specified in this subpart and subpart H of this part, require a covered employee selected through the random testing program to cooperate in urine testing to determine compliance with §219.102, and the employee must provide the required specimen and complete the required paperwork and certifications. Compliance by the employee may be excused only in the case of a documented medical or family emergency.
Title 49: Transportation
PART 219—CONTROL OF ALCOHOL AND DRUG USE
Subpart G—Random Alcohol and Drug Testing Programs
§ 219.603 Participation in drug testing.