What is the law for car repossession for a used car at a buy here pay here dealership?

It may vary by state, but car repo (snatch and run) is against the law in Louisiana. If the repo man shows up wanting you to sign some papers, and has a cop sitting close by, don't worry. By law, if you don't sign that piece of paper, they cannot take your car. (The cop and repo guy are friends, or just got a kick back.) But it's easier to do that than go to court and end up paying the court fees also.