Oh Pete, I didn't know you were funny
a real cop, you idiot. There is no general rule, but in order to really hold up in court, you have to be doing at least 10mph over the limit. 7-9mph can be pushing it depending on the cops mood. It also can boil down to the angle the cop is parked in relation to your vehicle if he is using a doppler radar unit. Now, if h/she is using laser, forget about it. Your nailed. Doppler units can be tricky if you understand them. But, I understand that in St. Mary's if you get a ticket, you just have to do community service and that will take care of it.