Editing How to beat a speeding ticket

I am going to court in Virginia for driving 21 mph above the posted speed limit. I was clocked at 76 in a 55 mph zone. Driving 20 miles or more above the limit is a class 1 misdemeanor. Any chance I can argue that I was going less than 75 or are radar detectors so accurate they are never off even by a few miles per hour?

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−	+	I am going to court in Virginia for driving 21 mph above the posted speed limit. I was clocked at 76 in a 55 mph zone. Driving 20 miles or more above the limit is a class 1 misdemeanor. Any chance I can argue that I was going less than 75 or are radar detectors so accurate they are never off even by a few miles per hour?