Every time you step outside or drive to the grocery store, you break dozens of laws without realizing it, and some of them are very serious. When a cop sees this, he could snap his fingers and have you thrown in jail. But most cops are cool guys so they let it slide. They are able to let it slide because of a little something known as police discretion, which means that if a cop sees you break a law, he can let it slide if he wants to. Police discretion is a good thing for you because without it you would be in jail. So next time you see a cop, thank him and buy him a beer. If you don't, then it's your own fucking fault when he enforces the law on you.