I guess my question is this: Is it easier to make a passable fake ID or use a fake SS number or is it easier to fake a supervised fingerprint scanner?
I'd be willing to state that generally speaking, yes, it's easier to make a passable fake ID. It's at least a little harder to fake a fingerprint for a supervised scan. Blending for color match and hiding any seams takes work and would have to be renewed regularly. A fake ID takes a certain amount of equipment depending on the style of ID the state uses, but many places have them today. Such a device can produce hundreds of fake IDs, whereas a fake fingerprint has to be personalized, and doesn't have the economy of scale.
I suggested the ink pad to limit 'invasion of privacy' allegations because the idea would be that the print wouldn't be entered into the system unless an identity question/problem arose.