Meeting in a police parking lot might not be a bad idea, but I would be very surprised if the seller agreed to this, and equally disappointed in anyone in the office made a copy of the seller's ID. This information on an ID card is protected under the Privacy Act and the police would not have any authority to collect it. Since the sale is a civil issue, there is no reason for law enforcement to be involved. As a former Deputy Sheriff, if you asked me to do this, you would receive a polite "no".