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The Drug and Alcohol Clearinghouse (DACH) is a secure, online database administered by the Federal Motor Carrier Safety Administration (FMCSA). The purpose of the DACH is to provide law enforcement, state licensing agencies, and employers in the transportation sector with real-time compliance information on commercial license and permit holder's drug and alcohol program violations. The DACH warehouses data on violations, including positive drug or alcohol test results along with test refusals. As drivers complete their return to duty processes and follow-up testing plans post violation, these details are added to their respective clearinghouse record. All safety-sensitive drivers who hold a CDL and CLP license are subject to this requirement and should register with the DACH.