A broad term for any matter of public concern that is addressed by a government in law or policy.
State legislatures pass laws to address matters of public interest and concern. A law that sets speed limits on public highways expresses an interest in protecting public safety. A statute that requires high school students to pass competency examinations before being allowed to graduate advances the state's interest in having an educated citizenry.
Although the state may have a legitimate interest in public safety, public health, or an array of other issues, a law that advances a state interest may also intrude on important constitutional rights. The U.S. Supreme Court has devised standards of review that govern how a state interest will be constitutionally evaluated.
When a law affects a constitutionally protected interest, the law must meet the Rational Basis Test. This test requires that the law be rationally related to a legitimate state interest. For example, a state law that prohibits a person from selling insurance without a license deprives people of their right to make contracts freely. Yet the law will be upheld because it is a rational means of advancing the state interest in protecting persons from fraudulent or unscrupulous insurance agents. Most laws that are challenged on this basis are upheld, as there is usually some type of reasonable relation between the state interest and the way the law seeks to advance that interest.
When a law or policy affects a fundamental constitutional right, such as the right to vote or the right to privacy, the Strict Scrutiny test will be applied. This test requires the state to advance a compelling state interest to justify the law or policy. Strict scrutiny places a heavy burden on the state. For example, in roe v. wade, 410 U.S. 113, 93 S. Ct. 705, 35 L. Ed. 2d 147 (1973), the state interest in protecting unborn children was not compelling enough to overcome a woman's right to privacy. When the state interest is not sufficiently compelling, the law is struck down as unconstitutional.