How do I dispose of a canister of CS gas?

[usuallyagoodcitizen]

I've had a canister of CS gas in my posession for about 10 years - someone brought it back from the US when I was living in a rough part of London! It fits on a keyring. I don't really want to have it around any more, but I don't know how to dispose of it. I can't really walk into a police station and hand it over, can I? What should I do?

What an excellent thread title...

I would imagine that the only safe way to get rid of it is to hand it in, tbh. You could always say you found it if you're worried.

Just a stupid question though, is it still dangerous after 10 years? I genuinely have no idea, is it something that expires or lasts forever?

What even the latest round of pre electioneering Tories haven't driven you to use it

ive got the top 3 threads