The Clearinghouse is a secure online database run by FMCSA that records drug and alcohol program violations by holders of a commercial driver's license (CDL) or commercial learner's permit (CLP) (49 CFR 382.701).

• Employers query it before hiring a driver and at least once a year.
• MROs, employers, C/TPAs, and SAPs report violations and return-to-duty progress to it.
• State licensing agencies check it before issuing, renewing, or upgrading a CDL or CLP.

The official site is clearinghouse.fmcsa.dot.gov.