Laser is light. They use the doppler effect to bounce it of your car. Unlike radio frequency Radar it is more difficult to "jam". Be carefull there are Federal laws dealing with jamming.
Here we are rquired to stop both directions when a school bus is loading or unloading. Also to pull over and stop, yielding to emergency vehicles. Failure to do so is a hefty fine, they take it very seriously. Also 25mph school zones, strictly enforced. The crossing guard will turn your plate in.