Free Will and Moral Responsibility

Free Will and Moral Responsibility

Is free will required for moral responsibility? If a person with a brain tumor breaks the law, should that person be judged by lower standards? It's a slippery slope, because if a legal defense is based on a 'my brain did it, not me' theory, and if it holds, law enforcement will suffer. Our jails would be less crowded, but our streets would teem with criminals.