[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: 49CFR382.207] [Page 165] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 382_CONTROLLED SUBSTANCES AND ALCOHOL USE AND TESTING--Table of Contents Subpart B_Prohibitions Sec. 382.207 Pre-duty use. No driver shall perform safety-sensitive functions within four hours after using alcohol. No employer having actual knowledge that a driver has used alcohol within four hours shall permit a driver to perform or continue to perform safety-sensitive functions.