### Comment:
You don't get off if the cop says you were going 70. Only way to prove him wrong is to prove the device was faulty.

### REPLY:
I always just subtract 8 from whatever I was actually doing when a cop says, 'Do you know how fast you were going.' 
  
 It's worked for me 2/2 times, and I think it's cuz they don't even know how fast I was going...

### END.