People have been worried about restrictions on this for a while now. The stuff is so readily available and widely used I don't see it happening anytime soon. However, I'm not saying it's not a good idea to stock up a bit either. The shelf life is 3 years if properly stored so don't go too overboard on the back stock.
A little off topic but it always makes me chuckle hearing people refer to any substance as having a shelf life.
A bottle of past date morphine will still very likely kill you, salt remains a salt, the only thing that really matters is how it's stored.
I'd bet any money that 50 year old, well stored SN will still kill someone as much as freshly bought SN.
People have a habit here of being far to clinical and I get it, I appreciate that we don't want people to suffer or be in pain but equally I don't want SN to ever get restricted and people feel so rushed to CTB because they feel their SN is near 3 years old and may not work, that's unlikely to happen.
I hear the same said about N.
This is a poor example because we're talking about chemicals and not food but it's just the same as companies putting 'best before dates' on their products and people throwing those foods out after the 'best before date'. The food's still good and just fine to eat, it will just 'taste' better if ate before this date.
Don't get me wrong some chemicals wrongly stores, especially when moisture gets into them, can lose their effects but I've heard of people finding super old sleeping tablets that aren't on the market anymore or old bottles of morphine or other substances and taking them and they still work just as good.
Don't go throwing your SN out after 3 years people, it's it's air tight sealed and stored well you'll be just fine.