What must a medical examiner obtain from a prescribing clinician regarding controlled substance use?

A medical examiner is required to obtain a written letter from a prescribing clinician regarding a driver's use of controlled substances. This documentation is essential because it provides a formal and verifiable record of the prescription, ensuring that the medical examiner can accurately assess the potential impact of the substance on the individual's ability to operate a commercial vehicle safely. Written correspondence also helps maintain clear communication and accountability, allowing for standardized practices in the evaluation process.

In this context, while other forms of communication could provide information, such as verbal confirmations or electronic submissions, they may lack the formal structure and reliability of a written letter. An approval letter is a less commonly used term in this context and would not encompass the comprehensive information needed regarding controlled substances. Therefore, reliance on a written letter aligns with the best practices for ensuring the safety of commercial drivers under the guidelines established for medical evaluations.