Well, you obviously don't know the law. An officer can pull you over and ticket you for anything, with or without a tool like a radar gun to prove anything.
If your friend fought it, instead of being a lemming and paying it, he likely would have gotten off in court. Cops know people do this, so they get paid and give out tickets.
fight EVERYTHING worth while.
The only ticket i paid in recent times was my $38 seatbelt fine.... because i was really doing 125+ mph in a 55 zone. lol He earned that 38 from me and i gladly paid it, because going to court because i did in fact have my seatbelt on, and telling the judge i was really doing 125 in a 55 zone is just, well, stupid