Commercial vehicles/CDL

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. This includes, but is not limited to:

  • Interstate and intrastate motor carriers, including passenger carriers
  • School bus drivers
  • Construction equipment operators
  • Limousine drivers
  • Municipal vehicle drivers (e.g., waste management vehicles)
  • Federal and other organizations that employ drivers subject to FMCSA drug and alcohol testing regulations (e.g., Department of Defense, municipalities, school districts)

FMCSA is proposing the state requirement be implemented on January 6, 2023. States will check the DACH prior to completing licensing transactions, such as the issuance, renewal, transfer, and upgrade of a CDL.

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