I believe a small variance over the speed limit is normal for most police officers.
A speedometer is a mechanical device that has some amount of error. That error is probably linear, if your speedometer is off by 2 mph at 30 mph, it might be off by 5 or 6 mph at 60 mph and above.
In my car, the error is actually under, so at 70mph, I'm actually doing about 67 or so.
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