I don't know the answer to that if it is not stated in the policy how that is handled.
If it is not in the policy, if it could be done, this is a way to help drivers do what they need to do to continue to operate. (As you know, there are some who might not follow through otherwise)
But at the least, I would send him a message about doing it and ask if it is OK. You would have proof that he consented and he would get a heads up.