Follow-up testing may be extended for up to 60 months following return to duty. Fifty percent of all CDL drivers will be tested for use of controlled substances each year. Tests must be unannounced and spread throughout the calendar year. Random selection could result in a driver being selected for testing more than once in a calendar year. Testing for controlled substances will be conducted by urinalysis.
Drug testing is conducted by analyzing a driver's urine specimen.
The specimen collection procedures and chain of custody ensure that the specimen's security, proper identification and integrity are not compromised. The Omnibus Transportation Employee Testing Act requires that drug testing procedures for CDL drivers include split specimen procedures. Both bottles are sent to a laboratory. Only the primary specimen is opened and used for the urinalysis. The split specimen bottle remains sealed and is stored at the laboratory.