Law of Michigan

The law of Michigan consists of several levels, including constitutional, statutory, regulatory and case law. The Michigan Compiled Laws form the general statutory law.

The Constitution of Michigan is the foremost source of state law. Legislation is enacted by the Michigan Legislature, published in the Acts of the Legislature, and codified in the Michigan Compiled Laws. State agency regulations (sometimes called administrative law) are published in the Michigan Register and codified in the Michigan Administrative Code. Michigan's legal system is based on common law, which is interpreted by case law through the decisions of the Supreme Court and Court of Appeals, which are published in the Michigan Reports and Michigan Appeals Reports, respectively.

The foremost source of state law is the Constitution of Michigan. The Michigan Constitution in turn is subordinate to the Constitution of the United States, which is the supreme law of the land.

Pursuant to the state constitution, the Michigan Legislature has enacted legislation. These legislative acts are published in the official Public and Local Acts of the Legislature of the State of Michigan and are called "session laws". They in turn have been codified in the Michigan Compiled Laws. Both are published by the Michigan Legislative Service Bureau (LSB).

Pursuant to certain statutes, state agencies have promulgated regulations, also known as administrative law. The regulations are published in the Michigan Register (MR) and codified in the Michigan Administrative Code (MAC or AC). The Michigan Administrative Code was last printed in 1979. The Annual Administrative Code Supplement (AACS) is the annual supplement to the Michigan Administrative Code containing the rules published in the Michigan Register for that year. All three works are published by the Michigan Office of Regulatory Reinvention within the Michigan Department of Licensing and Regulatory Affairs. From 1980–1997, the AACS was published by the LSB.

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