Cops have good memories. Seconds after a bolo was issued at 10:02 p.m.to look for a gray or silver Dodge Charger with Pennsylvania tags believed headed down Route 110 that is wanted for trying to run down a Lawrence police officer, a Lowell cop said he remembered the car. He stopped it a couple of months ago and remembered it was a rental car and that the driver lived on Stackpole Street. Just as interesting was that the driver had a large amount of cash on him.