How do medical examiners typically assess drug use in commercial drivers?

Medical examiners typically assess drug use in commercial drivers primarily by using urine drug screening. This method is favored due to its effectiveness in detecting a wide range of substances, including illegal drugs and certain prescription medications that may impair driving ability. Urine tests can identify the presence of these substances over a period of time after use, making it a practical choice for monitoring compliance with safety regulations.

While other methods such as blood tests and psychological evaluations can provide additional information, urine drug screening is standardized and frequently mandated in the commercial driving industry. Self-reporting is not reliable enough on its own due to the potential for dishonesty or bias from the drivers themselves, and blood tests are typically more invasive and not as practical for routine monitoring as urine tests. This comprehensive approach ensures that medical examiners can uphold safety standards effectively.