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 Saturday, July 25, 2026, at 9 a.m. Eastern Time, the Drug and Alcohol Clearinghouse will undergo scheduled maintenance. Users may experience intermittent issues during this maintenance time, which should take approximately 3 hours.
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United States Department of Transportation
FMCSA - Federal Motor Carrier Safety Adminstration

Drug & Alcohol Clearinghouse

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How must a Federal Motor Carrier Safety Administration (FMCSA)-regulated employer respond to requests for information from an employer that is regulated by a different Department of Transportation (DOT) mode?

Per 49 CFR 40.25(h), all DOT-regulated employers are required to comply with requests for information under § 40.25(b). Therefore, when an FMCSA-regulated employer receives an inquiry from an employer regulated by another DOT modal agency, such as the Federal Railroad Administration (FRA), Federal Transit Administration (FTA), or Federal Aviation Administration (FAA), the FMCSA-regulated employer must promptly release the most recent result of a Clearinghouse query they conducted on the driver. This information would be available in the FMCSA-regulated employer’s Query History page.

FMCSA-regulated employers should not refer employers regulated by other DOT modes to the Clearinghouse to obtain this information. Only FMCSA-regulated employers are authorized to query the Clearinghouse.

Last Updated : March 07, 2023