Ultimately, it is the Captain's head that the responsibility rests on...... however, as to how an individual is assessed, is a matter for the brigade.
I think the bottom line for approving drivers is does the crew feel safe when driving with this person? If the answer is no, then they either need more practice, some re-education, or stopped from driving!
I have detailed my brigade's process for drivers before....I think on this website......?
Basically, there are three levels of drivers. Those who can drive under normal road conditions, NOT to callouts of any type. Next level is a restricted emergency driver - they can drive to callouts under normal road conditions (no Priority 1 driving), can drive around an incident and return to station.
Third level is an unrestricted emergency driver - can drive under lights & sirens, and any other driving conditions.
Because my brigade has two appliances, people can be an unrestricted emergency driver for one appliance, and a restricted emergency driver on the other...all depends on their capabilities.......
As the Captain, I have the ultimate say in who does what, and the ultimate responsibility.
Having undertaken both Ambulance & Police driver training, I reckon I am reasonably well qualified to say who does what in my brigade!
Pip