49 C.F.R. § 40.277 : Transportation — OFFICE OF THE SECRETARY OF TRANSPORTATION — PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING PROGRAMS — PROBLEMS IN ALCOHOL TESTING — Are alcohol tests other than saliva or breath permitted under these regulations?

No, other types of alcohol tests ( e,g., blood and urine) are not authorized for testing done under this part. Only saliva or breath for screening tests and breath for confirmation tests using approved devices are permitted.

49 C.F.R. § 40.277