Innovative techniques for detection and prevention of cheating in exam

Sheer laziness - Yes , we all have those group of students in a batch that prefer to occupy the last benches in a class. With their wit , sarcasm and perfectly timed comments they do sometimes manage to make boring lectures fun. However this group which could might as well be smarter than the toppers of the batch usually lack the determination and will to put this brilliance to action. So they more or less depend on the benevolence of the people around them in exam halls.