The FDA has stated that liquid MMA should not be used for nails since the 1970s, but as of 2010, it is only banned in 38 states. And like all illegal things, just because it is illegal doesn't mean it's not being used. (Hello, crack dealers!)
I'm sure all of those 38 states have a different sentence for possession and/or use of it because that's just how the US is, but I know of a state that considers it a 2nd degree misdemeanor where the punishment is a $500 fine and/or imprisonment not to exceed 60 days. (Although I'm a little confused about this ban seeing as they don't state if it's just the liquid form that's banned since l&p powders have MMA in the form of PMMA?) Of course all this has to happen AFTER an investigation following up on reports made about that person/salon. Exactly how many? I have no idea. Given the country's budget situation, I don't see "monitoring salons to ensure none are using prohibited products" as a top priority.
I don't mean to sound negative about it all, but I just wanted to show that although the FDA is aware of MMA and how toxic it can be, it's still there and being used. And not all 50 states is on board, so therefore, it really doesn't make a world of difference whether it's prohibited or not. It's like a college degree in a useless subject. Sure you've got it all nice and official looking, but it's about as useful as a third nipple.