49 C.F.R. § 382.113 Requirement for notice.
Title 49 - Transportation
Before performing each alcohol or controlled substances test under this part, each employer shall notify a driver that the alcohol or controlled substances test is required by this part. No employer shall falsely represent that a test is administered under this part.
Title 49: Transportation
PART 382—CONTROLLED SUBSTANCES AND ALCOHOL USE AND TESTING
Subpart A—General
§ 382.113 Requirement for notice.

