It's easy to tell if someone is cheating or not in time attack events, you just have to select their ghost as your target. The guy currently in 1st place in the touring discipline is terrible in turns and a missile down the straights. It couldn't be more obvious. The other events however it isn't that easy, since you can't drive against player's ghosts. I'm currently 2nd in the open wheel event, almost 2 seconds clear of the guy in 3rd. I hope that's only because the challenges are still in the early stages but I wouldn't be surprised if I got falsely reported because of the big gap. I can't see any other solutions to this other than VAC...