Part 382 — Controlled Substances and Alcohol Testing
49 CFR Part 382: Federal drug and alcohol testing requirements for commercial motor vehicle drivers.
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49 CFR Part 382 requires motor carriers to implement a controlled substances and alcohol testing program for drivers who operate commercial motor vehicles requiring a CDL. The program covers multiple testing triggers — pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up — and ties into the FMCSA Drug and Alcohol Clearinghouse.
The FMCSA Drug and Alcohol Clearinghouse, created by the FAST Act of 2015 and operational since January 2020, is a federal database of CDL driver drug and alcohol program violations. Carriers must conduct pre-employment queries of the Clearinghouse before allowing a new driver to operate, and must conduct annual queries for all current CDL drivers. Drivers with unresolved violations cannot operate a CMV until they complete the return-to-duty process.
Random testing under Part 382 requires carriers to test a minimum percentage of their driver workforce each year — currently 50% of drivers for drugs and 10% for alcohol annually. Carriers must use a random testing consortium or conduct their own random selections that meet FMCSA’s statistical requirements. Failure to maintain a compliant testing program is one of the most common reasons FMCSA places carriers on the Unsatisfactory safety fitness list.
Key Provisions
- Requires pre-employment drug testing before any new CMV driver can operate under a carrier’s authority.
- Mandates random drug testing of at least 50% of driver workforce annually (10% for alcohol).
- Requires post-accident testing for drivers involved in crashes meeting defined severity thresholds.
- Mandates annual Clearinghouse queries for all current CDL drivers and pre-employment queries for new hires.
- Drivers with unresolved Clearinghouse violations are prohibited from operating a CMV until return-to-duty is complete.
Why It Matters to Truck Owners
Part 382 compliance is one of the highest-stakes areas in trucking regulation. A carrier found operating drivers without a compliant testing program can face immediate compliance review and potential authority revocation. When buying a truck from a carrier, ask about their testing program — a carrier without proper random testing documentation has a serious compliance gap that could affect the vehicle’s operating history and the seller’s ability to transfer authority.
Frequently Asked Questions
What drugs are tested under the FMCSA drug testing program?
FMCSA-required drug testing uses DOT-approved 5-panel tests covering marijuana (THC), cocaine, amphetamines/methamphetamine, opioids, and phencyclidine (PCP). Testing must be conducted at a DOT-certified collection site and analyzed by a SAMHSA-certified laboratory.
What is the FMCSA Drug and Alcohol Clearinghouse?
The Clearinghouse is a secure federal database that records drug and alcohol program violations by CDL holders. Carriers must query it before hiring a driver and annually for all current drivers. Drivers with open violations cannot operate a CMV until they complete the return-to-duty process.
What happens after a driver tests positive under Part 382?
A driver who tests positive must be immediately removed from safety-sensitive functions and cannot return until they complete the DOT return-to-duty process, which includes evaluation by a Substance Abuse Professional (SAP), treatment as recommended, a return-to-duty test, and follow-up testing. The violation is recorded in the Clearinghouse.
Read the official legal text: 49 CFR Part 382 — eCFR.gov (official)
Related Federal Trucking Laws
- FAST Act (2015)
- Part 391 — Driver Qualifications
- Part 383 — Commercial Driver’s License (CDL) Standards
- Part 395 — Hours of Service of Drivers
- Part 381 — Waivers, Exemptions, and Pilot Programs
This page is provided for informational purposes only and is not legal advice. Always verify current requirements at fmcsa.dot.gov or with a qualified transportation attorney.
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