Can the police make a deal with you then back out?

Yes, police can make a deal, such as a plea agreement or a cooperation agreement, but they can also back out of it under certain circumstances. If the deal is not formalized in writing or is contingent on specific conditions, they may withdraw if those conditions are not met. However, if a formal agreement has been reached, backing out could raise legal issues, including potential claims of breach of contract or wrongful inducement. Ultimately, the specifics of the situation and applicable laws will determine the outcome.