1. The officer will record the speed and they must calibrate the radar or laser before use. They need to be trained to do so. The officer will say they offered, and u say he didnt. The court will always believe the police officer. Bad idea to lie in court, it just pisses off the judge.
2. The radar or laser will be hidden from your view, either in the vehicle, or behind a tree. They do it so you can't see itm thats the point.