[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR219.102] [Page 219] TITLE 49--TRANSPORTATION CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 219_CONTROL OF ALCOHOL AND DRUG USE--Table of Contents Subpart B_Prohibitions Sec. 219.102 Prohibition on abuse of controlled substances. No employee who performs covered service may use a controlled substance at any time, whether on duty or off duty, except as permitted by Sec. 219.103.