I would make sure ALL of your mods are within your state's specs. That means, getting the CO output levels tested. Secondly, if he said your buddy was doing 72 in a 55, good chance he was. There are more and more Lasers in use and less Radars, so if the cop had laser that's it, no arguemnt. Best you can do is ask the cop at what distance he read you at..... laser guns will tell velocity and distance up to 1500 ft. and they have to write if they used laser or radar on the ticket. If they do use laser, they will write the distance they clocked you at.