I'm not sure I've ever bought a private party vehicle in California where the seller provided the "required" smog cert. Sure, it's the law, but it isn't followed. I once provided a cert on a vehicle I was selling. The buyer noticed that the signature on it was mine. (I smogged my own cars when I worked at the Dealership). He questioned whether the vehicle was really in compliance, or if I was just providing the paper? I offered to tear it up, and he could find out on his own, but assured him that it would pass. He kept the cert. And drove the car for almost another 10 years. It was a good one.
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SoP that you, Don and I are referring to is purchasing a Syclone from out of state. He's going to have to have it smogged, VIN-verified (AutoClub can do this), and take it to a Certified Scale for a weight certificate because it's a pick-up, and will need to have it's unladen weight verified for the required "commercial plates".