Commercial Driver's License

Drug and Alcohol Clearinghouse (DACH)

The Drug and Alcohol Clearinghouse (DACH) is a secure online database operated by the Federal Motor Carrier Safety Administration (FMCSA). DACH provides employers, state driver licensing agencies, and state law enforcement personnel real-time information about commercial driver’s license (CDL) and commercial learner’s permit (CLP) holders’ drug and alcohol program violations.

The DACH contains records of violations of drug and alcohol prohibitions including positive drug or alcohol test results and test refusals. When a driver completes the return-to-duty process and follow-up testing plan, this information will also be recorded in the Clearinghouse.

Drivers holding CLPs or CDLs are subject to this federal requirement and should be registering with the DACH. Non-CDL holders and their employers are not subject to DACH requirements and should not be registering with the Clearinghouse.

Beginning November 18, 2024, the Iowa DOT will be required to check the DACH prior to completing licensing transactions, such as the issuance, renewal, transfer, and upgrade of a CLP or CDL. The Iowa DOT will also be required to downgrade a person’s CLP or CDL if notified by FMCSA of a DACH violation.

DACH is a FMCSA program and is not administered by the Iowa DOT. For more information visit or call the FMCSA information line at 1-800-832-5660 or the FMCSA Iowa Field Office at 515-233-7400.

For a more detailed FMCSA overview of the DACH process for employers visit


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