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Transportation Drug & Alcohol Compliance

DOT Drug & Alcohol Testing Regulations & Resources

A practical resource center for employers responsible for federally regulated transportation drug and alcohol testing programs. Find the core DOT testing rule, agency-specific regulations, 2026 random-testing rates, current federal guidance, forms and direct links to the official resources for FMCSA, FAA, FRA, FTA, PHMSA and the U.S. Coast Guard.

DOT-regulated employers generally must follow 49 CFR Part 40 together with the separate rule issued by the operating agency that regulates their safety-sensitive employees. Drug Test Compliance provides nationwide testing and C/TPA support to help employers administer those requirements.

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How DOT Drug & Alcohol Testing Regulations Work

DOT compliance has two layers. Part 40 establishes the common procedures used throughout federally regulated transportation workplace drug and alcohol testing. The applicable operating-agency regulation then determines which employees are covered and when testing is required.

1

49 CFR Part 40

Common DOT testing procedures used across transportation modes.

  • Urine and authorized oral-fluid collection procedures
  • Collectors, BATs and STTs
  • HHS-certified laboratories
  • Medical Review Officer (MRO) procedures
  • Drug and alcohol test documentation
  • Refusals and problem collections
  • SAP, return-to-duty and follow-up procedures
  • Service-agent and C/TPA responsibilities
Official Part 40 ↗
2

Your DOT Agency Rule

Industry-specific requirements for the regulated employer and employee.

  • Who performs a regulated safety-sensitive function
  • Required testing circumstances
  • Random-testing program requirements
  • Post-accident or post-casualty criteria
  • Reasonable-suspicion or reasonable-cause rules
  • Education, training and policy requirements
  • Agency-specific reporting and recordkeeping
  • Additional industry-specific program obligations
Agency Directory

DOT Drug & Alcohol Testing Regulations by Agency

Choose the agency that regulates the safety-sensitive work being performed. Each section includes the governing testing rule, the subjects covered by that agency’s official resources, and direct links to federal guidance. As Drug Test Compliance adds dedicated agency guides, this page will serve as the central directory to those individual DTC resources as well.

FMCSA

Federal Motor Carrier Safety Administration

49 CFR Part 382 + 49 CFR Part 40

FMCSA regulates covered commercial motor vehicle drivers subject to CDL requirements. Its resources address motor-carrier regulations, driver qualifications, hours of service, drug and alcohol testing and the FMCSA Drug & Alcohol Clearinghouse.

CDL Drivers Clearinghouse Random Testing Consortium / C/TPA
DTC FMCSA & Clearinghouse Guide → FMCSA.gov ↗ Drug & Alcohol Program ↗
FAA

Federal Aviation Administration

14 CFR Part 120 + 49 CFR Part 40

FAA resources cover aviation safety and regulated drug and alcohol testing programs, including covered air carriers and operators, specified safety-sensitive aviation functions, program implementation and employer/service-agent responsibilities.

Aviation Part 120 Safety-Sensitive Functions Drug Abatement
FAA.gov ↗ FAA Drug Abatement ↗ AC 120-126A ↗
FRA

Federal Railroad Administration

49 CFR Part 219 + 49 CFR Part 40

FRA resources cover railroad safety and drug/alcohol requirements for covered service, maintenance-of-way and mechanical employees, including railroad operations, post-accident toxicological testing, random testing, reasonable suspicion/cause and compliance plans.

Railroads Part 219 Post-Accident Covered / MOW / Mechanical
FRA.dot.gov ↗ FRA Drug & Alcohol ↗ 49 CFR Part 219 ↗
FTA

Federal Transit Administration

49 CFR Part 655 + 49 CFR Part 40

FTA resources support covered public transportation employers and transit employees, including bus and rail operations, safety programs, training, drug and alcohol testing requirements, MIS reporting and technical assistance.

Public Transit Part 655 MIS Reporting Training
FTA.dot.gov ↗ FTA Drug & Alcohol Program ↗
PHMSA

Pipeline & Hazardous Materials Safety Administration

49 CFR Part 199 + 49 CFR Part 40

PHMSA resources cover pipeline safety and drug/alcohol testing for covered employees performing operations, maintenance or emergency-response functions on regulated pipeline and LNG facilities, including operator plans, contractor oversight and required testing.

Pipelines Part 199 Covered Functions Operator Plans
PHMSA.dot.gov ↗ PHMSA D&A Overview ↗ 49 CFR Part 199 ↗
USCG

United States Coast Guard

46 CFR Parts 4 & 16 + applicable Part 40 procedures

Coast Guard resources cover maritime safety, merchant mariner requirements and chemical testing for dangerous drugs, including pre-employment, random, reasonable-cause, periodic and serious-marine-incident testing requirements.

Maritime 46 CFR Part 16 Mariners Serious Marine Incidents
USCG.mil ↗ USCG Drug Testing ↗ 46 CFR Part 16 ↗
Current 2026 Reference

2026 DOT Random Drug & Alcohol Testing Rates

The following are the minimum annual random-testing rates published by DOT for calendar year 2026. Rates vary by agency and can change from year to year, so employers and C/TPAs should confirm the current DOT rate.

Agency / Employee Group Random Drug Rate Random Alcohol Rate
FMCSA 50% 10%
FAA 25% 10%
FRA — Covered Service 25% 10%
FRA — Maintenance of Way 25% 10%
FRA — Mechanical 50% 10%
FTA 50% 10%
PHMSA 50% N/A

Source: U.S. DOT — 2026 Random Testing Rates ↗

Multiple DOT agencies: DOT states that employers and C/TPAs subject to more than one DOT agency rule may combine covered employees into a single random-selection pool when the applicable requirements are followed. USCG-covered employees may also be combined with DOT-covered employees in drug-testing pools.

Current Federal Guidance

Important 2026 DOT Drug-Testing Updates

Effective April 27, 2026

Revised Federal Custody & Control Form

HHS/OMB approved a revised 2026 Federal CCF for paper and electronic use. DOT published transition information for regulated testing and directs employers and service agents to the current federal form guidance.

May 15, 2026

New Official Part 40 Q&A

DOT published May 2026 Part 40 Questions & Answers. DOT states that its Part 40 Q&As constitute official and authoritative guidance and interpretation concerning 49 CFR Part 40.

Effective June 10, 2026

Part 40 Oral-Fluid Contingency Rule

DOT amended Part 40 to address situations in which an oral-fluid collection is required but cannot be conducted because oral-fluid testing is not yet available, requiring directly observed urine collection in the specified circumstances.

2026

SAP / Return-to-Duty Guidance

DOT issued additional 2026 notification material concerning Substance Abuse Professionals and the return-to-duty process. Employers should continue to follow Part 40’s SAP, RTD and follow-up requirements.

2026 CCF Notice ↗ Part 40 Q&A ↗ Part 40 Federal Register Updates ↗ ODAPC Listserve Notices ↗
Employer Compliance

Core DOT Drug & Alcohol Program Responsibilities

Employers may use qualified collectors, laboratories, MROs, SAPs, BATs/STTs and C/TPAs, but the regulated employer remains responsible for compliance with its DOT program and the actions taken on its behalf.

  • Determine which employees and functions are DOT safety-sensitive
  • Follow Part 40 and the correct operating-agency regulation
  • Maintain required testing policies and program procedures
  • Complete applicable pre-employment testing before covered work begins
  • Maintain compliant random pools and annual testing rates
  • Apply agency-specific post-accident / post-casualty rules
  • Meet reasonable-suspicion / reasonable-cause requirements
  • Use qualified collectors, laboratories, MROs, BATs/STTs and SAPs
  • Maintain required education, training, records and reports
  • Take required action after positive tests and refusals
  • Complete SAP, RTD and follow-up requirements when applicable
  • Keep DOT testing separate from non-DOT/company-authority testing

Using a C/TPA does not transfer compliance responsibility. A service agent can perform many administrative functions, but the regulated employer remains responsible for meeting DOT requirements. Part 40 also limits which employer decisions can be delegated to a C/TPA.

Official Federal Resource Library

DOT, Agency & SAMHSA Compliance Resources

Direct links to the federal agencies and resource areas employers use for regulations, program guidance, safety requirements, testing procedures, specimen-collection guidance, laboratory information and federal forms.

Drug Test Compliance Resources

Continue to the DTC Guide or Service You Need

These internal resources connect the regulatory information on this page to program administration, testing services and agency-specific compliance support.

DOT Drug & Alcohol Testing Nationwide DOT testing services and employer program support. C/TPA Services Nationwide program administration, random pools and consortium support. FMCSA & Clearinghouse Dedicated motor-carrier testing and Clearinghouse compliance guide. SAP / RTD / Violations Return-to-duty, Clearinghouse violations and follow-up testing.
Common Questions

DOT Drug & Alcohol Testing Regulation FAQs

Is 49 CFR Part 40 the only DOT drug-testing regulation an employer must follow?

No. Part 40 establishes the common procedures for DOT drug and alcohol testing. The employer must also follow the operating-agency regulation that applies to the safety-sensitive employee, such as FMCSA Part 382, FAA Part 120, FRA Part 219, FTA Part 655 or PHMSA Part 199.

Which DOT agency regulates commercial truck drivers?

FMCSA regulates covered commercial motor vehicle drivers who are subject to CDL requirements. FMCSA’s drug and alcohol testing rule is primarily located in 49 CFR Part 382, while Part 40 supplies the testing procedures.

Does the FMCSA Clearinghouse apply to every DOT-regulated employee?

No. The FMCSA Drug & Alcohol Clearinghouse applies to covered CDL/CLP drivers and employers under FMCSA’s Part 382 program. Other transportation modes have their own agency-specific requirements.

Can an employer use a C/TPA to manage a DOT drug and alcohol testing program?

Yes. DOT allows employers to use qualified service agents, including C/TPAs, for many program functions. The employer remains responsible for compliance, and certain decisions or determinations cannot ordinarily be delegated.

Can a DOT test also be used to test for additional non-DOT drugs?

DOT tests must remain DOT tests and follow the federally required procedures and testing panel. Company-authority or non-DOT testing should be conducted separately rather than adding non-DOT analytes to a DOT test.

Where should employers verify the current DOT random-testing rates?

DOT publishes the current minimum annual random-testing rates through the Office of Drug & Alcohol Policy & Compliance. Because rates can change, employers should verify the current calendar-year rate rather than relying on an older table.

What is the difference between DOT and SAMHSA drug-testing resources?

DOT/ODAPC administers the procedures that apply to federally regulated transportation testing under Part 40. SAMHSA/HHS maintains important federal workplace-testing resources, including HHS Mandatory Guidelines, laboratory certification information and the Federal Custody and Control Form. DOT-regulated employers should follow DOT requirements and use HHS/SAMHSA resources where Part 40 incorporates or relies on them.

Last reviewed: September 1, 2026. Drug and alcohol testing rules, agency guidance, federal forms and annual random-testing rates can change. This page provides general compliance information and links to primary federal sources; it is not legal advice.
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