They also missed the part about searches and seizures without probable cause. Indeed, what possible cases could this dick cop have for searching the car of a 72 year old man after a routine traffic stop.
The article doesn't say when he bought the flintlock. My guess is that he was followed or his plate was placed on a radar, and the cop used some stupid excuse to stop him.
The article also does not state what the traffic violation was.
I suspect the Van Gilder had a Firearm ID Card, and the police officer wanted to search his vehicle for this reason. The state has a list of all Firearm ID Card holders. One would have to assume that this list has been entered into the police databases. When a Firearm ID Card holder is stopped for a traffic infraction, it would be reasonable to assume that the FID pops up on the screen in the police cruiser when the driver's name is entered.
Since there are about a dozen ways to break the law when transporting a firearm in NJ (including keeping it in the glovebox), a police officer has a good chance of making an arrest if a person has a gun in the car. Tossing the vehicle of every FID holder is a good place to start.