The need for a drug screen to be included as part of the DOT physical will depend on the individual company’s on-the-job requirements, but in many cases, this does include a test for the presence of drugs or alcohol in the blood or urine. These substances can greatly impair a person’s ability to drive a motor vehicle, as well as slow down their reaction time, putting them at greater risk of causing an accident that can harm themselves and others, and in some cases cause death. A commercial vehicle can include a bus or a delivery truck, and if driven improperly or under the influence of drugs or alcohol, can put the driver and public at risk. For this reason, many companies who employ commercial drivers require that they complete a drug screen prior to starting work. The drug screen can be completed onsite during the rest of the DOT physical exam when performed at a center like Walking Urgent Care.