Ronald Bailey at Hit and Run comments on a New York Times article suggesting that disbelief in free will encourages cheating/rule breaking:
But is “free will” really necessary for a system of retributive justice? What is interesting in the above experiments is that the subjects believed that they could not be caught cheating. This illustrates the fact that there is more than a little truth to H.L. Mencken’s observation that “conscience is the inner voice which warns us that someone may be looking.” The possibility of punishment acts as a deterrent in even a completely deterministic world.