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.
An official website of the United States government Here's how you know
The .gov means it’s official.

Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

This site is secure.

The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

United States Department of Transportation
FMCSA - Federal Motor Carrier Safety Adminstration

Drug & Alcohol Clearinghouse

Can’t find the answer to your question? Try searching for key terms, such as “query” or “report violation.”

Showing you results for: “Which Clearinghouse users are notified when there is a change ”

Filter by UserType
Filter by Topic
Expand All Collapse All Show All FAQs

Which Clearinghouse users are notified when there is a change to a driver’s Clearinghouse record?

Employers who have previously conducted a query on a driver will be notified by email when there is new information in a driver’s Clearinghouse record if:

  • The query was initiated on or after the September 14, 2022 System of Records Notice; and
  • The new information was recorded after March 8, 2023.

All users registered under the employer, including Assistants, will receive the notification email. If a consortium third-party administrator (C/TPA) initiated the query on behalf of the employer, the C/TPA’s Clearinghouse users will also receive the notification email. These users will also see a notice of new information in the Query History.

Last Updated : March 09, 2023