DOT Drug Testing
49 CFR Part 40, or ―Part 40‖ as we call it, is a DOT-wide regulation that states how to conduct DOT Drug Testing and how to return employees to safety-sensitive duties after they violate a DOT drug and alcohol regulation. Part 40 applies to all DOT-required testing, regardless of what DOT agency-specific rule applies to an employer.
For example, whether you are an airline covered by FAA rules or a trucking company covered by FMCSA rules, Part 40 procedures for collecting and testing specimens and reporting of test results apply to you.
Each DOT agency-specific regulation spells out who is subject to testing, when and in what situations for a particular transportation industry.