California Smog question?

Ok so 1 year ago I sold my car to a guy "as is" and immediately turned in the release of Liability to DMV. Right after he got the car he switched the license plate to another car and went to jail. He got the car back and DMV told him he had to smog it before he can complete the reg. Now he is calling me and saying that I am responsible for the smog. The car was smoged before he got it but I cant remember if I had a smog slip. I don't think I did but either way after him having it for one year and getting it taken away from him am I still responsible. Any links you get the info from would be great. No negative comments please Im just asking to be sure before I dish out money unnessisarly.