Users may experience issues verifying ARIZONA commercial driver’s licenses (CDLs) in the Clearinghouse at this time due to system maintenance in Arizona. If this prevents an employer from conducting required pre-employment queries for information on ARIZONA CDL- and CLP-holders only, the employer may hire a driver using solely the procedures set forth in 49 CFR 391.23(e), as outlined in the frequently asked questions.

Also, on Monday, July 20, 2026, from 8 p.m. to 9 p.m. Eastern Time, Clearinghouse users will not be able verify driver CDL information due to FMCSA system maintenance.
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United States Department of Transportation
FMCSA - Federal Motor Carrier Safety Adminstration

Drug & Alcohol Clearinghouse

Learning Center / SAP

SAP

The resources below are designed to help Substance Abuse Professionals (SAPs) understand their requirements under the Clearinghouse regulations.

Download Resources for Substance Abuse Professionals

  1. About the Clearinghouse

    Learn about the Clearinghouse

  2. Registration

    Visit the Before You Register page to make sure you understand the registration process.

    Registration instructions:

  3. Violations and the RTD Process

    SAPs must report certain driver information about the return-to-duty (RTD) process in the Clearinghouse.

  4. Other Resources

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