I wouldnt worry about it in the USA. Getting ahold of SN in the states is way easier than in the UK or EU. Here in Germany for example, its actually legal to have SN but they have put restrictions in place on those that sell it, which makes it very difficult to attain cause you have to prove you are a company that needs said chemical.
Also, in the USA its legal to purchase firearms and those firearms are a nearly sure fire way to end ones life. This has been going on for hundreds of years and it wont be stopped any time soon.Now then, I think the only danger of SN getting restricted comes from the Pro life christian groups petitioning and calling in to stores to harass sellers. We really need more pro choice groups to go to battle against these control freak maniacs.