I can see in some instances where an operation would ask to see a cert card for a particular specialty that would involve greater danger. I am also AOW & Rescue (specialties in night, deep, navigation, underwater communications & Equipment specialist), but not EANx. I wouldn't expect an operation to give me nitrox without the proper proof of training (not that I'd even try). I would also expect an operation to bar me from doing cavern, wreck or diving situations that could put me at greater risk for an accident without proof of proper training. In my AOW, I did go over some wreck diving (I have only 1 training dive on this, so far), but as of today, I refrain from penetrating a wreck, with the reasoning that because of the greater risk, I should have more training before attempting it. I can't see the fact that the one operation only allowed a cert. deep diver to go to 90'. Most agencies say that a diver with deep diving certification is capable of going to the recerational limit of 130' or so. That part seemed a little silly to me. True ,there are some specialies that are there, not because of safety, but to enhance the diving experience. I would say that I'd be a bit upset if I weren't allowed to take a camera just because I'm not certified as an underwater photographer. Are there any true safety risks to photography? I can understand the need to see credentials for more dangerous activities because of liability of the dive operations, but if the activity doesn't present a greater safety risk, then let it be. I know my view may not be a popular. That's my two cents worth.