Final answer:
In criminal law, a person is not guilty of an offense unless they acted purposely, knowingly, recklessly, or with criminal negligence.
Step-by-step explanation:
In criminal law, a person is not guilty of an offense unless they acted purposely, knowingly, recklessly, or with criminal negligence. This principle is stated in Section 2.05 of the Model Penal Code, which sets out the mental states required for criminal liability. The mental states reflect different levels of intent or awareness that a person must have when committing a particular act.