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there is a law that says you can sell via the internet

I am pretty sure the law only allows to resell on the internet for over face if the website guarantees the tickets, like StubHub, Ticket Exchange, and places like that. Craigslist doesn't count. Now I have never heard of anyone getting in trouble for scalping on the internet as long as the tickets are good, even though it was through Craigslist. I don't know the exact law for other than internet.