
The police power is the basis for land-use planning authority in the United States. This authority is usually delegated by state governments to local governments, including counties and municipalities, which most frequently exercise police power in land-use planning matters. The police power is exercised by the legislative and executive branches of the various states through the enactment and enforcement of laws and regulations. States have the power to compel obedience to these laws through whatever measures they see fit, provided these measures do not infringe upon any of the rights protected by the United States Constitution or their own state constitutions. Federal police power has been defined by Supreme Court rulings, which have affirmed that Congress has limited power to enact legislation.
| Characteristics | Values |
|---|---|
| Police power is exercised by | Legislative and executive branches of the various states |
| Police power is enacted through | The enforcement of laws and regulations |
| States have the power to | Compel obedience to laws through various measures |
| Measures must not | Infringe upon rights protected by the US Constitution or state constitutions |
| Measures must not be | Unreasonably arbitrary or oppressive |
| Enforcement methods can include | Legal sanctions and physical means |
| Controversies arise when | Exercise of state power conflicts with individual rights and freedoms |
| Criminal cases are prosecuted | In the name of the governmental authority that enforces the police power of the state |
| Police power has its roots in | English and European common law traditions |
| Police power is | Restricted by the state constitution, exclusive federal government powers, the Takings Clause, and the Fourteenth Amendment |
| Police power is | Distinct from the government's taking of private property through eminent domain |
| Police power is | Delegated by state governments to local governments, including counties and municipalities |
| Police power is most frequently exercised in | Land-use planning matters |
| Federal police power is | Limited, as affirmed by the Supreme Court |
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What You'll Learn

Federal police power
In United States v. Morrison (2000), the Supreme Court further invalidated a provision of a federal law related to violent crime, highlighting the limitations on federal police power. The court asserted that "The regulation and punishment of intrastate violence that is not directed at the instrumentalities, channels, or goods involved in interstate commerce have always been the province of the States." This decision reinforced the distinction between federal and state police powers, emphasizing that certain matters, such as intrastate violence, are within the jurisdiction of state authorities.
The Tenth Amendment of the U.S. Constitution also plays a significant role in shaping federal police power. It 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 ensures that powers not explicitly granted to the federal government are retained by the states or the people, thereby restricting the scope of federal police power.
While federal police power has its limitations, there are instances where federal laws have been upheld despite overlapping with traditional state police powers. For example, in Hamilton v. Kentucky Distilleries Co. (1919), the Supreme Court unanimously upheld a wartime prohibition on distilled spirits, demonstrating that federal power can extend into areas typically associated with state authority under specific circumstances.
In summary, federal police power in the United States is shaped by Supreme Court interpretations, the Tenth Amendment, and the delineation of powers between the federal and state governments. While the federal government has limited authority to enact certain types of legislation, it can still exert its police power in areas related to interstate commerce and specific federal objectives. The balance between federal and state police powers is a dynamic aspect of U.S. constitutional law, with ongoing court cases refining and defining the boundaries of these powers.
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State police power
The police power is exercised by the legislative and executive branches of the various states through the enactment and enforcement of laws and regulations. State police power is delineated in the Tenth Amendment of the US Constitution, which 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 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.
While state police power is broad, it is not without limits. State laws and regulations must not infringe upon any rights protected by the US Constitution or state constitutions and must not be unreasonably arbitrary or oppressive. For example, in Commonwealth v. Alger, Chief Justice Lemuel Shaw acknowledged the existence of constitutional restraints on police power, stating that laws must apply equally and government interferences with individual rights must be reasonable and related to a legitimate legislative purpose.
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Police power and the Tenth Amendment
Police power is exercised by the legislative and executive branches of the various states through the enactment and enforcement of laws and regulations. States have the power to compel obedience to these laws through whatever measures they see fit, provided these measures do not infringe upon any of the rights protected by the United States Constitution or their own state constitutions. Methods of enforcement can include legal sanctions and physical means.
The concept of police power in America was expanded in a series of notable court cases in the late 19th and early 20th centuries, including the 1851 Massachusetts Supreme Judicial Court case Commonwealth v. Alger, and the 1905 Supreme Court case Jacobson v. Massachusetts. Due to the nebulous definition of police power, there are few restrictions on its use. In Commonwealth v. Alger, Chief Justice Lemuel Shaw wrote:
> "It is much easier to perceive and realize the existence and sources of [the police power] than to mark its boundaries, or prescribe limits to exercise."
However, Shaw also recognised that government interferences with individual rights must be 'reasonable' and must have a clear relation to some legitimate legislative purpose. Later court cases have expanded somewhat on these restrictions by limiting the ability of states to infringe upon implied constitutional rights and by demanding a stricter standard of reasonability.
Federal police power has been defined by Supreme Court rulings. In United States v. Lopez (1995), the court ruled that:
> "The Constitution... withhold [s] from Congress a plenary police power that would authorize enactment of every type of legislation."
In Hammer v. Dagenhart, five members of the Court found in the Tenth Amendment a mandate to nullify a law as an unwarranted invasion of the reserved powers of the states. This decision was expressly overruled in United States v. Darby. In the 1920s and 1930s, the Court invoked the Tenth Amendment to invalidate a series of congressional economic regulations as invasive of state police powers. In A.L.A. Schechter Poultry Corp. v. United States (1935), the Court relied on the Tenth Amendment to rebut the argument that the existence of an economic emergency could justify legislation extending beyond the powers of the federal government.
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Police power in land-use planning
The police power in the United States is the capacity of the states and the federal government to regulate behaviour and enforce order within their territory for the betterment of public health, safety, morals, and general welfare. The authority to use police power is rooted in English and European common law traditions, as well as two Latin principles: "sic utere tuo ut alienum non laedas" ("use that which is yours so as not to injure others") and "salus populi suprema lex esto" ("the welfare of the people shall be the supreme law").
In the context of land-use planning, police power is the basis for local governments' authority to regulate and make decisions regarding land usage within their jurisdictions. This authority is typically delegated by state governments to counties, municipalities, and other local governing bodies. The police power in land-use planning allows these local governments to enact and enforce laws and regulations that pertain specifically to land usage, such as zoning ordinances and development plans.
The exercise of police power in land-use planning matters must comply with certain constitutional restraints. For instance, laws must be applied equally to all citizens under similar circumstances, and government interventions with individual rights must be 'reasonable' and clearly related to a legitimate legislative purpose. It is important to note that the use of police power in land-use planning is distinct from the government's power of eminent domain, where private property may be taken for public use with just compensation. In cases where police power is exercised in land-use planning, private property owners are generally not entitled to compensation.
While the police power grants significant authority to the states and local governments in land-use planning, there have been controversies and legal challenges when its exercise conflicts with individual rights and freedoms guaranteed by the Constitution. As a result, court cases have played a pivotal role in defining and restricting the scope of police power. For example, in Commonwealth v. Alger (1851), the Massachusetts Supreme Judicial Court addressed a case related to land-use planning and the construction of a wharf on privately-owned tidelands around Boston Harbour.
In summary, the police power in land-use planning enables local governments in the United States to regulate and make decisions regarding land usage within their jurisdictions. This power is exercised through the enactment and enforcement of laws and regulations, with the ultimate goal of promoting the health, safety, and welfare of the community. While police power grants substantial authority, it is not without limitations, and it must be exercised within the boundaries set by constitutional protections and individual rights.
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Police power and individual rights
Police power in the United States is exercised by the legislative and executive branches of the various states through the enactment and enforcement of laws and regulations. While states have the power to compel obedience to these laws, they must not infringe upon any rights protected by the US Constitution or their own state constitutions, nor can they be unreasonably arbitrary or oppressive.
The police power is the basis for land-use planning authority in the US, and this authority is usually delegated by state governments to local governments, including counties and municipalities. This regulation based on police power is distinct from the government's taking of private property through the power of eminent domain. For example, under the authority of the police power, a private property owner is not typically entitled to compensation.
The nebulous definition of police power has resulted in few restrictions on its use. However, according to historian Michael Willrich, "government interferences with individual rights must be 'reasonable' – they must have a clear relation to some legitimate legislative purpose". Later court cases have expanded on these restrictions by limiting the ability of states to infringe upon implied constitutional rights and by demanding a stricter standard of reasonability.
Federal police power has been defined by Supreme Court rulings. In United States v. Lopez (1995), the court ruled that "The Constitution...withhold [s] from Congress a plenary police power that would authorize enactment of every type of legislation." This was further affirmed in United States v. Morrison (2000), where the court invalidated a provision of a federal law on violent crime. In addition, the Tenth Amendment has been invoked to invalidate federal laws that invade the states' reserved police powers to regulate public welfare and morality.
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Frequently asked questions
Police power is the authority to enact and enforce laws and regulations. This power is held by the legislative and executive branches of individual states, which can use whatever measures they see fit to compel obedience, provided these measures do not infringe upon any rights protected by the US Constitution or their own state constitutions.
In 1850, in American Print Works v. Lawrence, the New Jersey Supreme Court held that police had the power to destroy buildings to prevent the spread of a fire. In 1872, in the Slaughterhouse Cases, the US Supreme Court upheld a New Orleans law that required slaughterhouses to move to the outskirts of the city to maintain the cleanliness and health of the city as a valid exercise of police power.
The limits of police power are nebulous, but it is restricted 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.
The Tenth Amendment 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." The Supreme Court has relied on the Tenth Amendment to invalidate federal laws regulating economic activity because they invaded the states' reserved police powers to regulate public welfare and morality.
The federal government exerts police power through federal statutes that penalize actions such as the interstate transportation of lottery tickets, the transportation of stolen automobiles, and the mailing of obscene matter. The federal government also has the power to regulate prescriptions for the medicinal use of liquor and to control prison-made goods moved between states.

























