as already said....laser speed guns just give a measure of speed at a .25 second interval , no picture. A second Police officer would need to pull you over down the road to charge you. If that didn't happen then don't worry.
2 police officers are needed to produce a conviction in court, one to corroborate the other, if no photographic evidence is produced.
Plus you could challenge the accuracy of the laser gun, based on the manufacturers built in tollerances + or - relating to the accuracy of the reading of vehicle speed.
Failing that you could go on a 'bezerker' styleee rampage with an Uzi 9mm and some petrol bombs and do us all a favour.