said by Iamthelawwww :Unfortunately that doesn't work in NY. The primary evidence against you here is the officer's expert testimony that you were traveling the cited speed. The reading from the device is secondary to confirm the officer was right. You can successfully argue against his/her 'expertise' or against the accuracy/use of the speed measuring device but trying to argue against both almost never works.
If you know how radar beams from the microwave radar gun works, you can easily get a ticket thrown out by arguing that it wasn't you speeding, as it was the other vehicle next to you.
Laser radar guns that are not on a tripod, the unit moves when the officer pushes the button, resulting in a flawed reading that is +4mph above the speed you were doing.