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On Saturday, September 20, 2025 at 11:00 p.m. Eastern Time, the Drug and Alcohol Clearinghouse will be temporarily unavailable due to scheduled maintenance. The Clearinghouse will be operational as soon as maintenance is complete, which should take approximately 4 hours.
Select a topic below or filter by user type to find answers to your questions. If you have additional questions, you can contact FMCSA.