Transportation employees of DOT-regulated employers who perform tasks that have been defined as ‘safety-sensitive’ are subject to drug and alcohol testing.

This includes ‘reasonable suspicion’ testing, which is required when a properly trained supervisor suspects that an employee is under the influence of alcohol or illegal drugs based on the employee’s appearance, behavior, speech, or smell.

Supervisors and company officials who may need to make a ‘reasonable suspicion’ test determination are required to complete at least 1 hour of training on the signs and symptoms of DOT-prohibited drug use.