Trucking Terms Guide

Compliance / Driver files

Drug and Alcohol Clearinghouse in trucking

Short answer: FMCSA's database for certain commercial driver drug and alcohol program records.

Plain-English explanation

The Drug and Alcohol Clearinghouse is an FMCSA database that tracks commercial driver drug and alcohol violations, test refusals, and return-to-duty status. Employers must query the Clearinghouse before hiring a CDL driver and annually for existing drivers. Drivers with unresolved violations in the Clearinghouse cannot legally operate a CMV.

For compliance terms, the plain-English meaning is only a starting point. The current rule, filing status, or official record decides what the carrier should do next.

Why it matters in trucking

The Clearinghouse prevents drivers who tested positive or refused a test from quietly moving between carriers. Before the database, a driver could simply get hired by a new carrier without disclosing a prior violation. Now employers must query the Clearinghouse — a missed query is its own violation, and hiring a driver with an unresolved violation is another.

When a term touches authority, inspections, driver files, or filings, slow down and verify. Guessing can create more work than checking the source first.

Example in real use

A carrier offers a driver a job and runs a pre-employment Clearinghouse query. The results show a positive drug test from 14 months ago with no completed return-to-duty process on file. The carrier cannot hire the driver until the RTD process is complete and a final negative test is recorded in the Clearinghouse.

Common mistakes or confusion

  • Performing only a limited pre-employment query (which shows only a previous full-consent query count) instead of a full query — the driver must consent to a full query for the employer to see violation details.
  • Skipping the annual query for existing drivers, which is a separate FMCSA requirement from the pre-employment query.
  • Not understanding that the driver, not just the employer, has obligations to the Clearinghouse — drivers must designate a substance abuse professional and complete the RTD process before the violation is resolved.

Related terms

Driver Qualification File A carrier file containing required driver qualification records. Medical Card Proof that a commercial driver met medical certification requirements for driving a CMV. Motor Carrier A business that transports passengers or property by commercial motor vehicle. Operating Authority Permission tied to the type of regulated transportation a company may perform. New Entrant Safety Audit A safety review for new interstate motor carriers during their early operating period. Roadside Inspection An inspection of a commercial vehicle, driver, or paperwork conducted on the road or at a facility.

Related guides

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Sources and last updated

Compliance definitions are verified against current FMCSA registration guidance and 49 CFR before publication. See the sources page for full reference list.

Last updated: 2026-05-10