I worked at a factory in the past and a friend of mine came in one morning stating he got a speeding ticket the day before.
I asked him was he going to pay it off or fight it. He stated he'd love to fight it but couldn't afford a lawyer or know what to do to fight it. After talking with him he decided to fight it. A few weeks later he went to court and came back the next day saying the judge had dismissed the ticket. He asked the cop 2 questions on the stand that I had told him might work.
Did the officer know the proper calibration procedure for the radar unit and did he complete that procedure immediately before he allegedly clocked my friend going over the speed limit?
And could the officer explain exactly how the power lines overhead influenced the radar unit's calibration and readings?
He said the cop stammered a few words before saying No to both questions. My friend then asked the judge to dismiss the charges, which he did.
Years ago in high school, we had a state trooper come in and demonstrate the radar unit they were using at the time in NJ (I used to live there).... and that they had to use a non-damaged tuning fork to ensure the unit was properly calibrated to clock the actual speed of the vehicle. Now I'm sure modern radar and laser units don't need calibration any more using a tuning fork..... but that poor cop didn't know that and therefore couldn't answer the questions in front of the judge.
You only get to use stuff like that one time.