[Code of Federal Regulations] [Title 49, Volume 3] [Revised as of October1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR199.219] [Page 190] TITLE 49--TRANSPORTATION CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) PART 199--DRUG AND ALCOHOL TESTING--Table of Contents Subpart C--Alcohol Misuse Prevention Program Sec. 199.219 Pre-duty use. Each operator shall prohibit a covered employee from using alcohol within four hours prior to performing covered functions, or, if an employee is called to duty to respond to an emergency, within the time period after the employee has been notified to report for duty. No operator having actual knowledge that a covered employee has used alcohol within four hours prior to performing covered functions or within the time period after the employee has been notified to report for duty shall permit that covered employee to perform or continue to perform covered functions.