The rules say that people cant reuse code. How will people know if someone reused code?
You will know. The jam is supposed to be a challenge, and if you cheat at that, you're only cheating yourself imo.
In essence, they'll probably never figure it out unless it's blatantly obvious code has been ripped elsewhere. But it's ultimately up to how much respect and discipline you have for taking part in a challenge.
I think @Mad_Monkey, want to know if the judges have a way to discover whether someone is "cheating".
I mean: I'd be sad, because all the effort i will do for someone masking the "re-use" code (or "cheating") to get a better score than others making those who really put their hard work into trash. It's not fair, you know. Specially with good prices.
Judging system must be really rigid and solid to give everyone an equal chance.