. These regulations cover all transportation employers, safety-sensitive transportation employees and service agents -roughly 12.1 million people. The United States Department of Transportation's (DOT) rule, 49 CFR Part 40, describes all the required procedures for conducting workplace drug and alcohol testing for the federally regulated transportation industry. The 49 CFR Part 40 provides information on how drug and alcohol testing is conducted, who is authorized to participate in the drug and alcohol testing program, and what employees must do before they may return-to-duty following a drug and/or alcohol violation.

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