
The term police power does not appear in the US Constitution, but it is a concept that has been defined by Supreme Court rulings. Police power refers to the regulatory power of the state and federal governments to enact and enforce laws for the health, safety, morals, and welfare of their citizens. This power is limited by the state constitution, exclusive federal powers, the Takings Clause, and fundamental federal rights under the Fourteenth Amendment. The Tenth Amendment further clarifies the division of police power between the federal government and the states, stating that powers not delegated to the federal government are reserved for the states or the people. The exercise of police power by states can be controversial when it conflicts with individual rights and freedoms guaranteed by the US Constitution and state constitutions.
| Characteristics | Values |
|---|---|
| Definition | Police power refers to the regulatory power of the government. |
| Exercised by | The legislative and executive branches of the various states. |
| Scope | Affecting the rights of an individual when those rights conflict with the promotion and maintenance of health, safety, morals, and general welfare. |
| Restrictions | Laws must apply equally to all under like circumstances. Government interferences with individual rights must be 'reasonable' and have a clear relation to some legitimate legislative purpose. |
| Federal police power | The federal government does not hold general police power but may act where the Constitution enumerates a power. |
| State police power | The states hold the general police power, which is limited by the state constitution, powers held exclusively by the federal government, the Takings Clause, and fundamental federal rights through the Fourteenth Amendment. |
| Examples | State police power has been used to ban the export of immature citrus fruits, prohibit the sale of dangerous illuminating oils, and regulate gambling. |
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What You'll Learn

Federal police power
The term "police power" does not directly refer to the common understanding of police officers maintaining public order. Instead, it relates to the broad regulatory power of the government. The Tenth Amendment delineates the division of police power in the United States, stating that powers not delegated to the federal government by the Constitution are reserved for the states or the people. This means that the federal government does not hold general police power and can only act where the Constitution grants it the power to do so.
The federal government's police power is also exercised in areas where Congress has exclusive authority, such as the District of Columbia. For example, the federal government has upheld laws penalizing the interstate transportation of lottery tickets, women for immoral purposes, stolen automobiles, and tick-infected cattle. Additionally, it has enforced statutes prohibiting the mailing of obscene material and the forgery of bills of lading related to interstate shipments. These exercises of federal police power are based on the authority granted by the Constitution over interstate commerce.
While the federal government's police power is limited, it is essential to recognize that the states possess broad regulatory power. This state-level police power is defined by each jurisdiction's legislative body and is primarily focused on public health, safety, morals, and general welfare. The broadness of state police power has been recognized in modern jurisprudence, as seen in the 2019 California Supreme Court case T-Mobile, LLC v. City and County of San Francisco.
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State police power
The term "police power" does not appear in the US Constitution. However, the concept of police power is an important aspect of US constitutional law and federalism. Police power refers to the fundamental ability of a government to enact and enforce laws for the public good, and to compel obedience to these laws through various measures. While the term "police" may evoke images of law enforcement officers, police power is distinct and relates to the broader regulatory power of the state.
While state police power is extensive, it is not without limits. Court cases have imposed some restrictions, such as prohibiting state infringement on implied constitutional rights and demanding a stricter standard of reasonability. However, the nebulous definition of police power has resulted in minimal regulation and few restrictions on its use.
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Police power and the Tenth Amendment
The term "police power" does not appear in the US Constitution. However, police power is a concept in American law that refers to the permissible scope of federal or state legislation affecting individuals' rights when in conflict with the promotion and maintenance of public health, safety, morals, and general welfare. Police power is exercised by the legislative and executive branches of state governments through the enactment and enforcement of laws.
The Tenth Amendment of the US Constitution states that:
> The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
This amendment has been central to several court cases that have interpreted and defined the scope of federal and state police powers. For example, in Hammer v. Dagenhart, the Tenth Amendment was cited to nullify a law prohibiting the transportation in interstate commerce of goods produced by child labor as an invasion of state powers. This decision was later overruled in United States v. Darby, which upheld the Fair Labor Standards Act.
In another case, United States v. Lopez (1995), the Supreme Court ruled that:
> The Constitution... withholds from Congress a plenary police power that would authorize enactment of every type of legislation.
This ruling affirmed the limited power of Congress to enact legislation and highlighted the distinction between federal and state police powers.
In summary, while the term "police power" is not explicitly mentioned in the Constitution, the Tenth Amendment has been crucial in shaping the understanding and boundaries of federal and state police powers through various court interpretations and rulings.
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Police power and the Supreme Court
The term "police power" does not appear in the US Constitution. However, the Supreme Court has played a pivotal role in interpreting and defining police powers, the permissible scope of federal or state legislation, and the balance of interests between state and federal laws.
Police powers refer to the authority of state governments to enact laws and regulations that promote public health, safety, morals, and general welfare. This authority is delegated by state governments to local governments, including counties and municipalities, which exercise police power in land-use planning matters. The Supreme Court has consistently upheld state regulations that serve significant local health or safety interests, particularly in areas where states have traditionally held authority. For example, in Sligh v. Kirkwood (1915), the Court upheld a measure as a legitimate exercise of police power by a state to protect its resources.
However, the Supreme Court has also clarified that police powers can conflict with federal laws aimed at ensuring uniformity across state lines, especially in matters affecting interstate commerce. In United States v. Lopez (1995), the Court ruled that the Constitution withholds from Congress a plenary police power, limiting its ability to enact certain types of legislation. Similarly, in United States v. Morrison (2000), the Court invalidated a provision of federal law on violent crime, demonstrating the Court's role in restricting the federal government's police powers.
The Supreme Court has also addressed the division of police powers between the federal government and the states. In Hammer v. Dagenhart, the Court initially found that a federal law prohibiting the transportation of goods produced with child labour infringed on the reserved powers of the states. However, this decision was later overruled in United States v. Darby, where the Court upheld the federal government's power over interstate commerce.
In summary, while the term "police power" is not explicitly mentioned in the Constitution, the Supreme Court has provided significant clarification and interpretation of this concept through its rulings. The Court has balanced state interests against federal regulations, upheld state police powers in specific instances, and restricted federal police powers to ensure compliance with the Constitution and protect states' rights.
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Police power and individual rights
The term "police power" does not appear in the US Constitution. However, it is a concept that is central to the system of federalism embodied in the Constitution. Police power refers to the capacity of the states and the federal government to regulate behaviour and enforce order within their territory for the betterment of the health, safety, morals, and general welfare of their inhabitants. This power is primarily held by the states, with the federal government possessing it in limited contexts, such as over conduct occurring within US territories and activities related to interstate commerce.
The regulatory power of the states is broad and limited mainly by the state constitution, powers held exclusively by the federal government, the Takings Clause, and the incorporation of fundamental federal rights through the Fourteenth Amendment. State courts periodically decide on the validity of contested legislation that enables a state to exercise its police powers, including matters involving private concepts of health in contention with the public's health, such as mandatory immunization for school children.
The US Supreme Court has also played a role in defining federal police power through its rulings. In United States v. Lopez (1995) and United States v. Morrison (2000), the Court affirmed that Congress has limited power to enact legislation and invalidated provisions of federal laws on violent crime, respectively. The Court has also used a "'balance of interests' doctrine" to determine whether a state's exercise of implied police powers conflicts with federal law, upholding state legislation that protects the health, safety, or welfare of its citizens.
The nebulous definition of police power has resulted in few restrictions on its use. However, court cases have expanded on these restrictions by limiting state infringement on implied constitutional rights and demanding a stricter standard of reasonability. For example, in Commonwealth v. Alger, Chief Justice Lemuel Shaw recognised certain constitutional restraints on police power, stating that laws must apply equally and government interferences with individual rights must be 'reasonable' and clearly related to a legitimate legislative purpose.
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Frequently asked questions
No, the term "police power" does not appear in the US Constitution. However, the concept of police power is derived from the Tenth Amendment, which states that "powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
Police power refers to the broad governmental regulatory power held by the states. It allows states to enact and enforce laws and regulations to promote and maintain public health, safety, morals, and general welfare.
Examples of police power being exercised by states include:
- The New Orleans law requiring slaughterhouses to move to the outskirts of the city to maintain cleanliness and health.
- A Vermont statute requiring railroads to fence their lines and maintain cattle guards, with strict liability for damages to animals.
- A California law banning the export of immature citrus fruits to protect the reputation of the grower state.
Yes, a state's police power is limited by the state constitution, exclusive federal powers, the Takings Clause, and the incorporation of fundamental federal rights through the Fourteenth Amendment. Additionally, state laws must not infringe upon individual rights protected by the US Constitution or be unreasonably arbitrary or oppressive.

























