No dealer shall purchase precious metals or gems without first (i) ascertaining the identity of the seller by requiring an unexpired identification card issued by a governmental agency with the current legal address and a photograph of the seller thereon, and at least one other corroborating means of identification, and (ii) obtaining a statement of ownership from the seller. If the government-issued identification card does not bear the current legal address, the person shall present other documentation verifying his current legal address. The governing body of the locality wherein the dealer conducts his business may determine the contents of the statement of ownership.