My daughter was stopped in Louisiana and asked for her "license and registration". She had her license, but had no idea what a "registration" was. Nor did I when she told me about it. Your vehicle's registration is NOT your car title nor is it your car tag. It's that piece of paper that you get with your tag decal attached when you renew your tag. Next time you get a tag decal, before you throw it away read the piece of paper closely and I think you will see that it says "Registration". In Mississippi they never ask for it, but in Louisiana they do---at least some times.