There are minimum standardized requirements that must be performed on all personnel. Similar to the aviation industry, the aim is to detect latent diseases, physical deficiencies and other medical conditions, in the driver or pilot that may put the company at risk, in the event of a serious accident.
This is especially valid where the cause of the accident was a preventable medical condition, which may come to light after the fact, eg. Diabetic falling asleep behind the wheel.
The Medical Practitioner must be qualified to perform general health assessments, and must be an accredited and qualified Occupational Health Medical Practitioner.