Havent been on for a fews weeks so excuse me if i mention something already said .....
You wont get them on the accuracy of the gun, but its the operating proceedures of the officer and calibration of the gun ....
A couple of years ago hubby got done and we knew we werent going nearly that fast cause we were in a pack of cars, it wasnt until we moved across 4 lanes to get ready to exit that an officer who couldnt even see us reckoned we were doing like 145 or something stupid anyway, to which we were doing 100 cause there were cars infront of us .....
it cost us several thousand dollars hiring a solicitor who deals in speeding offences and many weeks of investigation in courts and documents, but in the end he got off.
They have to operate the guns in a certian manner eg. the distance we were away from the gun meant the officer was suposed to be using a try-pod as your hand cannot stabalise the gun over a certain distance and 1mm in hand movement can through the beam off onto something else, so half the time when you see them leaving on their window with the gun or sitting the car it may not be correct. this is all info they wont tell you you have to search for it. also the machines have to be re-calibrated using a set system every time the officer signs it out in the morning from the station, these documents have to be correct, the officer has to have the correct accredication to operate that version of the machine, if there are 4 versions, then they need to have been trained in them all ....
the list goes on .....
unless you have the cash and know your in with a shot, dont bother, it was alot of work! they settled hubby's dispute out of court when they realised we had all the info. if a case goes to court then anyone can find out the info but if the police dont take it to court it means you have something they dont want everyone else knowing .....