Yes, airlines and airport ground-handling companies regularly drug test baggage handlers as part of their safety and security protocols. Because the role of a baggage handler involves operating heavy machinery (such as tugs, belt loaders, and baggage tractors) and working in close proximity to multimillion-dollar aircraft and high-traffic tarmac areas, it is classified as a "safety-sensitive" position. In the United States, most airlines follow DOT (Department of Transportation) or FAA guidelines which mandate pre-employment drug screening as a condition of hire. Once employed, baggage handlers are typically subject to random drug testing, "reasonable suspicion" testing if an accident occurs, and "return-to-duty" testing after an absence. These tests usually screen for a standard panel of substances including marijuana, cocaine, opiates, amphetamines, and PCP. Even in states where certain substances are legal for recreational use, airline employees must adhere to federal regulations which maintain a strict drug-free workplace to ensure the safety of the crew, the passengers, and the ground operations staff.