What are the drug and alcohol testing requirements for DOT CDL drivers?

Generally, federal law requires that all CDL drivers who operate commercial motor vehicles subject to CDL requirements on public roads in the U.S. are performing safety-sensitive functions and are subject to DOT drug and alcohol testing. This includes all full-time, part-time, intermittent, backup and international drivers.

The times and situations that require testing include:


Situation descriptions and a post-accident chart is provided by the Federal Motor Carrier Safety Administration (FMCSA) at: 

Procedures for Transportation Workplace Drug and
Alcohol Testing Programs (49 CFR Part 40)

Federal Statute Part 382



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