The ALI performed an examination of the penal system in the U.S. and the prohibitions, sanctions, excuses, and authority used throughout in order to arrive at a cohesive synthesis to the extent possible, and the best rules for the penal system in the United States. Primary responsibility for criminal law lies with the individual states, which over the years led to great inconsistency among the various state penal codes. The MPC was meant to be a comprehensive criminal code that would allow for similar laws to be passed in different jurisdictions.