[Code of Federal Regulations] [Title 49, Volume 5] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR382.213] [Page 165-166] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 382_CONTROLLED SUBSTANCES AND ALCOHOL USE AND TESTING--Table of Contents Subpart B_Prohibitions Sec. 382.213 Controlled substances use. (a) No driver shall report for duty or remain on duty requiring the performance of safety-sensitive functions when the driver uses any controlled substance, except when the use is pursuant to the instructions of a licensed medical practitioner, as defined in Sec. 382.107, who has advised the driver that the substance will not adversely affect the driver's ability to safely operate a commercial motor vehicle. (b) No employer having actual knowledge that a driver has used a controlled substance shall permit the driver to perform or continue to perform a safety-sensitive function. [[Page 166]] (c) An employer may require a driver to inform the employer of any therapeutic drug use.