They didn't get arrested. They're probably puffing on your stash right now. Don't worry, I've been played like that once too, but once it happens to you, you'll never do it again.

For next time, you never, ever give anybody any money for anything unless you get collateral from them, as in if you give them $40, make sure they give you something in return $40 worth as well until you make the trade.

When I used to have to do this, I would often ask for ID's. Sometimes they'd give it to me, sometimes not (for obvious reasons).

So always ask for something personal of their until they get back. No bag, no return of personal item, simple as that.

Just learn from your mistake and never trust them again.