Well, if you monitor a street, people slow down in this particular area and go back to their speeding once they leave the designed area. If students know which

Well, if you monitor a street, people slow down in this particular area and go back to their speeding once they leave the designed area. If students know which exams have extra measures, they won't cheat on them, and will get a free pass everywhere else. If you don't, sure - at first there is no deterrence, but later (after a few students get failed and exposed for cheating), it will deter others from trying.