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Tell your friend that the standard deviation of a radar gun is 2-3mph. From statistics, this means there is a good chance that he was not actually speeding and instead it was the radar gun that was off. The court cannot prove beyond a reasonable doubt that you were speeding, and it will be thrown out. Iron Clad defense.
stats behind it: use a simple z-test, x - mean / std dev ==> 1 / 2.5 = .4... using a z-table, you can show that there is a 34% chance that your friend wasn't speeding and instead it was the radar gun that was off.
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