When is it mandatory for employers to test drivers involved in accidents?

Testing drivers involved in accidents is mandated when a driver receives medical treatment, as this serves to ensure the safety and integrity of the driving workforce and the general public. The rationale behind this requirement is twofold: it aims to investigate the potential influence of substances which may have contributed to the accident and also helps in establishing accountability and transparency in the event of legal or administrative follow-up.

When a driver requires medical treatment due to an accident, it suggests that there was a significant incident where determining the factors that caused the crash—such as alcohol or drug use—becomes critical. This not only plays a crucial role in workplace safety protocols but also aligns with compliance regulations that govern commercial driver safety.

While other options may seem relevant to the situation, they do not align with the standardized requirements set forth by regulatory bodies regarding substance testing following an accident. Testing after repairs or once an injury occurs is not explicitly mandated, and conditional testing based only on an admission of substance use does not establish a proactive safety protocol. Hence, the requirement focuses specifically on medical treatment as a key indicator prompting mandatory testing.