If the original poster were to compare all of the times s/he has admittedly sped through the area at 5 miles above the posted limit to the penalty of the one time s/he got caught at 11 or 12 miles above the limit, s/he is actually still ahead of the game.
It really does sound like you're just ticked off that you got caught.
Having a radar detector doesn't give you free rein to travel at the speed that you prefer, until the device sounds an alert. So it didn't go off? That makes the officer wrong, and you right? Using a radar detector permits a driver to attempt to avoid the law. Using a radar gun, etc. permits an officer to enforce the law.
I believe in the original post there was mention that it was a "free for all" that day. Perhaps persons on that road, in that school zone, had complained about persistant violators of the speed limit.
Many of the previous posts gave valid advice on testifying in court in an attempt to plead not guilty, and succeed.
You admit that you were speeding. Suck it up.