N.Y.C. Admin. Code § 17-608: § 17-608 Return to active duty testing.

A driver who has been removed from active duty pursuant to this chapter may not resume active duty until he or she passes a drug test and the medical review officer has determined the driver is fit to return to active duty. A driver who is tested under this section may be administered one or more unannounced drug tests for up to sixty months after returning to active duty.