Dressler, p. 78-101: Principle of Legality
There are three doctrines that balance the roles of the courts and legislatures in making criminal law:
1. The principle of legality says that courts should not create new crimes.
2. The doctrine of void-for-vagueness says that legislatures have to explain what they mean and not leave all the work up to the courts.
3. The rule of strict construction says that if a criminal law is uncertain, it should be decided with a slant toward the defendant.
1. The Requirement of Previously Defined Conduct
Case: Commonwealth v. Mochan
Case: Keeler v. Superior Court
1. The Values of Statutory Clarity
Case: In Re Banks