paddler3d
Guest
I have never had a dive operator turn me away when I pulled out my ADC Air Range card, but the training is completely different. Real commercial diving schools do not teach scuba. So it would be a good idea for your son to, at the least, go through a basic scuba course. I only say that because it does not sound like he has any experience on scuba and getting a pencil-whip by some instructor will not do him any favors.
muddiver sort of hit in on the nail head.
Another reason to is some clients may require it. I can think of one, and I don't dive commercially.