The FMCSA’s Drug and Alcohol Clearinghouse went into effect on Jan. 6, 2020. Here are some common questions that motor carriers need to know about the Clearinghouse requirements. WHAT IS THE FMCSA DRUG AND ALCOHOL CLEARINGHOUSE? The FMCSA’s Drug and Alcohol Clearinghouse is a secure online database that gives employers, the FMCSA, state driver licensing agencies, and state law enforcement personnel real-time information about drivers with a commercial driver’s license (CDL) or commercial learner’s permit (CLP) who have violated 49 CFR Part 382, Subpart B. The Clearinghouse contains information about positive drug or alcohol test results, test refusals, and when a driver completes the return-to-duty (RTD) process and follow-up testing plan.