Key features[edit]

Element analysis[edit]

Under the MPC, crimes are defined in terms of a set of "elements of the offense," each of which must be proven to the finder of fact beyond a reasonable doubt. There are three types of elements:

Criticism[edit]

Advocates of the MPC stress that the law must be clearly defined to prevent arbitrary enforcement, or a chilling effect on a population that does not know what actions are punishable. This is known as the legality principle.[7] However, critics say that the assumption that there are no possible legal systems between the extremes of "forbidden" and "allowed" is the central weakness of the MPC. British law, for example, assumes that a jury can decide what is "reasonable" both in the context of British law and social expectations as well as the specific accusation they are being asked to judge. Behavior may thus be deemed unlawful by a jury in cases where the MPC would require legislative change to produce a conviction.[8]

Use[edit]

The MPC is not law in any jurisdiction of the United States; however, it served and continues to serve as a basis for the replacement of existing criminal codes in over two-thirds of the states.[9] Many states adopted portions of the MPC, but only states such as New Jersey, New York, and Oregon have enacted almost all of the provisions.[10] Idaho adopted the model penal code in its entirety in 1971, but the legislature repealed this action two months after it came into effect in 1972.[11]


The repeal of the MPC in Idaho came about after intense rejection of the new codification due to the lack of laws regulating morality, areas of the MPC that affected important political groups in the state, and also prosecutors and police who were critical of some areas of the new MPC-based code. The state bar association, judiciary committees in the legislature, and the Supreme Court of Idaho defended the new MPC-based code. Chiefs in the objections were the omission of sodomy, adultery and fornication as crimes, as well as objection by gun owners of the new stricter gun control law.[12]


On rare occasions, the courts will turn to the MPC for its commentary on the law and use it to seek guidance in interpreting non-code criminal statutes. It is also used frequently as a tool for comparison.


Section 230.3 Abortion (Tentative draft 1959, Official draft 1962) of the MPC was used as a model for abortion law reform legislation enacted in 13 states from 1967 to 1972. It is included as Appendix B of Justice Blackmun's opinion in the January 22, 1973 Doe v. Bolton decision of the United States Supreme Court (Roe v. Wade's lesser-known companion case). It would legalize abortion to preserve the health (whether physical or mental) of the mother, as well as if the pregnancy is due to incest or rape, or if doctors agree that there is a significant risk that the child will be born with a serious mental or physical defect.


In October 2009, the ALI voted to disavow the framework for capital punishment that it had included in the MPC, "in light of the current intractable institutional and structural obstacles to ensuring a minimally adequate system for administering capital punishment." A study commissioned by the institute had said that experience had proved that the goal of individualized decisions about who should be executed and the goal of systemic fairness for minorities and others could not be reconciled.[13]

Commonwealth v. O'Malley