Fake cards are easy to make, I have one that shows me to be a "Discover Scooter" diver that I made as a joke after it was suggested by a friend. (It is obviously not a real certification card, I'm not trying to lie to people with it. I do not at all endorse making a fake certification to gain access to places you don't have the certification to dive.)
That is one problem with places that employ non-cavedivers to inspect the certificates of cave divers before letting them cave dive. As a cave diver, you'd be hard pressed to fool me. However, I gave my Discover Scooter card once on accident instead of my Cave card, and it was accepted. Of course, my buddy and I found that to be hilariously funny, but it's also kind of scary. I've also seen cave divers told they cannot dive because the person checking was unfamiliar with the agency or certification level. Less funny, and kind of sad.
It's getting harder now with more agencies offering certifications, and more levels within those agencies.
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