Said Farmer John would have to have some sort of indisputable photographic evidence before it would be a real problem.
Even photo's are not fool proof nor will they alone gaurantee a conviction.
Now that's just cheating! The biggest problem with glide approaches is setting yourself up to start the circuit from the right height & position. Doing it by the numbers from mid-downwind is too easy.
The hard part is surprising yourself with an 'engine failure'
In the absence of a nice big feild the circuit will do, certianly for flap timing (if any), we have one near the airfield for just this reason, i once tried a glide from 3 miles out to see if i could make it (carb heat on and warming the engine, which is a great cheat BTW for flight test)
Deploying flaps in a glide approach - just like the comment 'do i look fat in this dress' once its out there you can't reel it back in