Im Buying a Used Car From a Private Seller...?

at a very very good price! Now he says he has all the paper work on the car but when I told him I would buy it, just let me go to my bank and get the money, he said fine by the time you get back ill have the paper work ready. I took out the money and as I was heading back he called me and said, "I forgot the paper work in my other car if you wait for me I can go get it" I said fine ill wait. As I waited for him by the car I found alot of parking violations stashed in the back seat!! The guy told me he just bought the car from like a poline inpound auction thing. My question is, 1. If that car has multiple parking of moving violations, when I buy this car dose it make me responsable? 2. if thats the case how can I check if he dose owe money? 3.What else should I be looking out for at this time? I took the vin number down and told him I would be back tommorow he agreed. what can I do with the VIN? Carfax only tels me the history with crashes and stuff but what about this kind of stuff?