There was a story in AutoWeek about a year ago that spoke of a judge in New Jersey that would NOT accept any tickets given by the use of a laser. The anti-speeding coalition rep had them bring a laser gun into the courtroom and demonstrate how effective they work. As the trigger was pulled, the gun jerked and showed the judge that the wall was moving at 6mph. Of course the judge knew better and threw the case out.
Worth a try...good luck.