[mkaresh]

The problem with such validation is that hardly anyone would go through the effort to provide a VIN. The quality of the resulting information would be harmed far more through reduced sample sizes than helped by making it harder for people to report on cars that don't actually exist. Especially since there's never been any evidence of the latter.

The big problem is getting people to report on the cars they do have, not keeping them from reporting on cars they don't actually have.