These are some good videos to watch. Remember your rights and ask for a lawyer if they question you. Remember anything you say can be used against you.
Most people are busted because they don't take the 5th. Know the laws your your state. There is an article about a sting in BWI where Anne Arundel county police let a guy go because he did not break the law. Once the vice cops started talking about prices and services he decided to leave. They did not arrest him.