Fun story.
My friend and I souped up a pair of Twist N' Goâ„¢ 50cc scoots. Large, high compression cylinder, CF reeds, big carb, new exhaust, new variator/wights/springs.
Bloody hell was it fast. Like 60-70mph fast. Too fast for the chassis and brakes fast. Wheelies!
So my mate was making a run to the Quick-E-Mart, and blazing about at WOT. And a cop snagged him.
He was clocked at 66 in a 45.
The cop came over and gave him the bad news. My buddy looked at the cop quizzically and said - "Are you sure? This thing is a cheap 50cc scoot. I don't think it could EVER hit 45, let alone go over 45! Are you sure you got the right person?". After a few Q&As about the scoot, the Po-po let him go - sans ticket/warning!
I cannot imagine the police dept with the funding to definitively prove the displacement. I'm pretty sure 'scooter crime' isn't menacing enough to warrent their own CSI department.
Eventually, we both ended up selling the scoots. It was just too much to drive safely. And we were lucky to hit 40mpg. HA!