DOT & ELD Guidance Blog


Learn about the six required DOT drug tests and procedures for addressing drug-testing violations.
J.J. Keller Editor Kathy Close

Kathy Close - DOT Editor - J. J. Keller & Associates, Inc.

October 30 , 2019

The requirements for DOT drug testing are outlined in 49 CFR Part 382 and drivers operating commercial motor vehicles (CMVs) requiring a commercial driver’s license (CDL) are subject to these regulations. Procedures for administering the drug tests are outlined in 49 CFR Part 40. The regulations require laboratory analysis of a urine specimen for the presence of the following drugs:

  • Marijuana metabolites
  • Cocaine metabolites
  • Amphetamines
  • Opioids
  • Phencyclidine (PCP)

Only laboratories certified by the Department of Health and Human Services may be used, and a urine specimen is currently the only acceptable method of testing for drugs.

Six Required DOT Drug Tests

The regulations require the following DOT drug tests:

  1. Pre-employment
  2. Post-accident
  3. Random
  4. Reasonable suspicion
  5. Return-to-duty
  6. Follow-up testing


A negative pre-employment test result must be received before the driver operates a CMV requiring CDL.


Required for an accident meeting the criteria prescribed in §382.303 while operating a CMV requiring a CDL. In post-accident testing, the use of police drug tests may be used in lieu of a motor carrier test where police will make results available.


The minimum annual random drug testing rate is 25 percent. In other words, the number of completed random drug tests must equal at least 25 percent of the average number of driving positions at the carrier over the course of the calendar year.

Reasonable suspicion

Requested of a driver when a trained supervisor observes physical, behavioral, speech, and performance indicators of probable use of drugs.

Return-to-duty and Follow-up

Drivers who fail a drug test, or violate the prohibitions against using drugs, are subject to return-to-duty and follow-up testing.

DOT Procedures Following a Drug-Testing Violation

First, the driver must be removed from safety-sensitive functions. The employer must then advise them of resources available in resolving a drug abuse problem.

The driver must be evaluated by a substance abuse professional (SAP) who determines what assistance is needed. The driver must be evaluated again after treatment by the SAP to determine whether the program was followed appropriately. If the SAP feels the driver may return to duty, he or she will issue a report to the motor carrier outlining the follow-up program.

This letter allows the motor carrier to request a return-to-duty test (performed under direct observation). Before a driver returns to duty, he or she must pass the drug test.

The driver must also submit to at least six unannounced follow-up tests, also performed under direct observation, in the first 12 months following return to duty. The SAP can prescribe follow-up testing up to five years.


NOTE: Are you ready for the new requirements of the Drug & Alcohol Clearninghouse? Download our Clearinghouse Checklist for details on how to comply.



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