[Code of Federal Regulations] [Title 49, Volume 7] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR655.47] [Page 69] TITLE 49--TRANSPORTATION CHAPTER VI--FEDERAL TRANSIT ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 655_PREVENTION OF ALCOHOL MISUSE AND PROHIBITED DRUG USE IN TRANSIT OPERATIONS--Table of Contents Subpart E_Types of Testing Sec. 655.47 Follow-up testing after returning to duty. An employer shall conduct follow-up testing of each employee who returns to duty, as specified in 49 CFR Part 40, subpart O.