"However, the real test of certified calibration, is the record of when the antennas were last sent to the lab for testing, and when the lab’s test rig was also tested. It’s interesting to see what happens when this evidence is asked for in trial, because a typical cop won’t think to bring a copy of either of these documents, or even know if and when his department sent the antenna out for testing. If the rules of court require testing of “scientific measurement devices,” and you as the defendant openly challenge the admissibility of the evidence, then the onus is on the cop to prove it meets the state’s standard."
http://skattertech.com/2011/02/how-my-smart-phone-got-me-out-of-a-speeding-ticket-in-traffic-court/
