"Charged" and "convicted" without doubt are certainly different: I personally know of a man who went to jail because his step-daughter resented his disciplining of her. When she could not have him charged with any physical abuse because he did not commit any, she fabricated an elaborate scenerio and got him charged with abuse against her. After the man was incarcerated, she privately told friends that he had done nothing to her. Nevertheless, he was not released for a year.
Now, when there is no doubt about the conviction, the only way to prevent him or her from recommitting such acts is to do what is suggested in the previous post. However, with the great number of "bleeding hearts," in the contemporary world, this will probably not happen.