I am most distrustful of cops with and without radar.
Got pulled over for 42 in a 35. Now I knew I was a tad over 35 but not over 40 so I went to court to defend it. I was probably the 8th person to go before the judge. 6 others ahead of me were all there over the same cop, the same day, the same speeding ticket - every single one was for 42 on the same section of 35 mph. Judge hammered everyone ahead of me. I get up there and question the cop about his training, calibration of the radar and then I hit him with the 7 tickets at 42 question. I asked him how many other days he's experienced with no deviation in the speed result. "Happens quite often". I asked him about resetting the the device. He says it doesn't have to be reset, it's self resetting. I asked him how he documents a specific car, does it print a receipt, some evidence of the speed. "No". Judge cuts me off. "Son you're boring this court. I find you guilty as charged, that'll be $65 and $135 court costs, pay the clerk." But Judge..... "Son say another word and I'll fine you $200 for contempt of court".
Second go round, cop walks up "I have you doing 38 in a 30 mph zone". But officer, look I've got a digital speedometer. It read 33 when you pulled me over. He looks down. "Okay, but you weren't wearing your seat belt when you passed me. That'll cost you $40 and 0 points."
Of course I was wearing the seat belt.
I paid the ticket.