The Model Panel Code is designed by the United States to assist and stimulate the legislatures in updating and standardizing the penal law. In simple terms, I can define the Model Panel Code as a legal insanity’s test. It has provided legislation basis for more than two-thirds of the American States. I agree with my classmate that the MPC is a fundamental feature of criminal law since it has influenced greatly criminal courts. The Model Panel Code is also taught to students pursuing law and is tested on Bar Exam. Using standardized terms of Mens Rea or otherwise known as culpability, is one of the Model Pane Code’s major innovation (Sampsell, 2012). Culpable states of mind are defined and organized by the Model Penal Code into four categories and they are: purposely, knowingly, recklessly and negligently. I will further elaborate on these four categories in this paper.