[Code of Federal Regulations] [Title 14, Volume 2, Parts 60 to 139] [Revised as of January 1, 1999] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR135.251] [Page 718] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (Continued) PART 135--OPERATING REQUIREMENTS: COMMUTER AND ON-DEMAND OPERATIONS--Table of Contents Subpart E--Flight Crewmember Requirements Sec. 135.251 Testing for prohibited drugs. (a) Each certificate holder or operator shall test each of its employees who performs a function listed in appendix I to part 121 of this chapter in accordance with that appendix. (b) No certificate holder or operator may use any contractor to perform a function listed in appendix I to part 121 of this chapter unless that contractor tests each employee performing such a function for the certificate holder or operator in accordance with that appendix. [Doc. No. 25148, 53 FR 47061, Nov. 21, 1988]