I'd like to start with the fact that I have no affiliation with this dealership so it is not a biased opinion in any way. The state of Florida has absolutely no such 3 day law on an any automotive purchase via a sales contract for financing or a straight cash transaction. And any local police involvement as you mentioned must be treated in a civil fashion . The local law enforcement cannot and must not get involved with any civil matters period. If in fact you are going to purchase a used automobile from anyone, utilize the proper prepurchase inspection companies in order to avoid any unnecessary heartache or surprises. Take it from a 10 year veteran in the automobile industry! And furthermore if the dealership was kind enough to entertain a trade in of the problem vehicle or a swap of some kind, that is a 100 percent sign of goodwill on behalf of the owners of the company due to the fact that they are under no obligation to do so. Car dealers are not necessarily out to get and betray the general public but sometimes even us in the industry get sold vehicles with unknown problems!