
The concept of police power in the United States 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). Police powers refer to the authority granted to state governments to enact laws and regulations that promote public health, safety, morals, and general welfare. While the Tenth Amendment to the United States Constitution reserves powers not delegated to the federal government to the states or the people, the Supreme Court has played a critical role in interpreting and balancing state police powers with federal regulations, particularly in matters of interstate commerce. The nebulous definition of police power has resulted in few restrictions on its use, with courts generally upholding state regulations that serve significant local health or safety interests.
| Characteristics | Values |
|---|---|
| Police powers refer to the authority granted to state governments to enact laws and regulations that promote public health, safety, morals, and general welfare. | N/A |
| The concept of police power draws on two Latin principles: "sic utere tuo ut alienum non laedas" and "salus populi suprema lex esto". | N/A |
| Police power is defined in each jurisdiction by the legislative body, which determines the public purposes that need to be served by legislation. | N/A |
| Police power is primarily concentrated within state governments, while the federal government possesses it in limited contexts. | N/A |
| The Supreme Court plays a critical role in interpreting the extent of these powers, often balancing state interests against federal regulations. | N/A |
| The Supreme Court has consistently upheld state regulations when they serve significant local health or safety interests, particularly in areas where states have traditionally exercised authority. | N/A |
| The court has also reinforced federal preemption in cases where Congress has established comprehensive regulations, limiting the states' ability to intervene. | N/A |
| State courts render decisions on the validity of contested legislation that enables a state to exercise its police powers. | N/A |
| The Tenth Amendment to the United States Constitution states that powers not delegated to the federal government are reserved to the states or the people. | N/A |
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What You'll Learn

The Tenth Amendment
The text of the Tenth Amendment is as follows: "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 was drafted by Connecticut Representative Roger Sherman and introduced in Congress by James Madison, who stated that several states were eager to ratify it.
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State vs federal powers
The concept of "police power" in the United States refers to the authority of state governments to enact laws and regulate behaviour to protect and ensure the health, safety, morals, and general welfare of their citizens. While the federal government does not possess general police power, it has limited police powers in specific contexts, such as over conduct occurring within US territories and activities related to interstate commerce.
The division of police powers between state and federal governments in the US is outlined in the Tenth Amendment to the 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 can only act in areas where the Constitution specifically grants it power, while the states hold broader regulatory powers and the general police power.
State police power is primarily defined and exercised by state legislatures, which determine the public purposes that legislation must serve. State courts also play a role in interpreting and upholding the validity of state laws enacted under police powers. While federal laws generally take precedence over state laws, the US Supreme Court has often upheld state police powers, even when they conflict with federal laws, using a "balance of interests" approach.
The broad authority of state police power has been recognised in various court cases. For example, in the 1851 case of Commonwealth v. Alger, the Massachusetts Supreme Judicial Court ruled that laws must apply equally and that government interference with individual rights must be reasonable and related to a legitimate legislative purpose. In the 1905 case of Jacobson v. Massachusetts, the US Supreme Court upheld a state's authority to require immunisations during a smallpox outbreak, balancing individual liberties with the public welfare.
While the federal government lacks general police power, it has asserted federal police power in certain areas. For example, in United States v. Lopez (1995), the Court ruled that Congress has limited legislative power and does not possess plenary police power. However, in United States v. Darby, the Court upheld the power of Congress over interstate commerce, stating that it "acknowledges no limitations other than are prescribed in the Constitution." The federal government has also exercised police power through its taxation and spending powers and control over interstate commerce.
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Limits to police powers
The concept of police power in the United States is rooted in English and European common law traditions, as well as two Latin principles: "sic utere tuo ut alienum non laedas" (use what is yours without harming others) and "salus populi suprema lex esto" (the welfare of the people is the supreme law). This power allows states and the federal government to regulate behaviour and enforce order within their territories to promote health, safety, morals, and general welfare. However, there are limits to these powers, as outlined below:
The police powers of the state and federal governments are limited by specific rights guaranteed under the United States Constitution. These limitations ensure that government interferences with individual rights are reasonable and have a clear relation to a legitimate legislative purpose. The Fourteenth Amendment's due process clause restricts how much a state can impact a person's life, liberty, or property. For example, public health regulations must not violate a person's constitutional rights. The Fifth and Fourteenth Amendments also play a role in limiting state power by guaranteeing certain procedural and substantive due process rights.
The Tenth Amendment to the United States Constitution reserves powers not delegated to the federal government for the states or the people. This includes police powers, which are primarily concentrated within state governments. Federal police power is limited, as seen in cases like United States v. Lopez (1995) and United States v. Morrison (2000), where the Supreme Court ruled against the federal government's plenary police power.
State courts also play a role in limiting police powers by rendering decisions on the validity of contested legislation. In matters of public health versus private health concerns, courts tend to uphold laws that promote the public welfare. However, as noted in Commonwealth v. Alger, the boundaries of police power are nebulous and difficult to define, leading to minimal regulation.
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Police powers and private property
In the United States, the police power is defined as the capacity of the states and the federal government to regulate behaviour and enforce order within their territory for the betterment of health, safety, morals, and general welfare. The Tenth Amendment to the United States Constitution states that powers not delegated to the federal government are reserved for the states or the people. As a result, police power is primarily concentrated within state governments, with the federal government possessing limited authority in specific contexts, such as over conduct within US territories and interstate commerce.
The authority for the use of police power is rooted in English and European common law traditions, as well as Latin principles like "sic utere tuo ut alienum non laedas" ("use what is yours without injuring others") and "salus populi suprema lex esto" ("the welfare of the people is the supreme law"). The nebulous definition of police power has resulted in minimal regulation and few restrictions on its use.
In the context of private property, police power is distinct from eminent domain, which is the government's power to acquire private property for public use, such as for streets, parks, and public buildings. While eminent domain requires just compensation to the property owner, the exercise of police power typically does not entail compensation. For example, in land-use planning matters, police power may be used to regulate zoning, and private property owners are generally not entitled to compensation.
While the police generally require a warrant to search private premises, there are exceptions. For instance, they may enter private property without permission when in close pursuit of someone they believe has committed or attempted to commit a serious crime. Additionally, they may search a vehicle if they suspect it contains stolen property, drugs, or a substantial amount of cash obtained through criminal activity. In the interest of public health and safety, the police power may also be used to enforce immunisation requirements for school children, despite potential conflicts with private medical or religious concerns.
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Supreme Court rulings
In the United States, the police power is the ability of the states and the federal government to regulate behaviour and enforce order within their territory for the betterment of health, safety, morals, and general welfare. The Tenth Amendment to the United States Constitution states that powers not delegated to the federal government are reserved for the states or the people. As a result, police power is primarily concentrated within state governments, with the federal government possessing it in limited contexts, such as over conduct occurring within US territories and activities related to interstate commerce.
The Supreme Court plays a crucial role in interpreting the extent of police powers, often balancing state interests against federal regulations. While states have broad police powers, they can conflict with federal laws aimed at ensuring uniformity across state lines, especially in matters of interstate commerce. The Supreme Court has consistently upheld state regulations when they serve significant local health or safety interests, particularly in areas where states have traditionally exercised authority. For example, in Sligh v. [defendant], the Supreme Court upheld a state's police power to ban the export of immature citrus fruits, despite impeding interstate commerce, to protect the reputation of the grower state.
In United States v. Lopez (1995), the Supreme Court ruled that the Constitution withholds from Congress a plenary police power that would authorise the enactment of every type of legislation, thus affirming the limited power of Congress to enact legislation. In United States v. Morrison (2000), the Supreme Court invalidated a provision of a federal law on violent crime, stating that the regulation and punishment of intrastate violence are within the province of the states and an example of police power.
The Supreme Court has also upheld state regulations that serve bona fide concerns for the public's well-being, such as immunisation requirements for school children, despite conflicting with private or individual concerns. In Cooley v. Board of Wardens of the Port of Philadelphia (1852), the Supreme Court upheld a local regulation that posed unique hazards to navigation in the Philadelphia harbour, recognising the state's interest in local regulation.
In recent years, judicial interpretations have evolved, influenced by changing societal contexts and calls for reforms, particularly regarding police practices. Notable rulings have included the restriction of police powers to enter a home without a warrant and the clarification of powers for tribal police.
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Frequently asked questions
Police powers refer to the authority granted to state governments to enact laws and regulations that promote public health, safety, morals, and general welfare.
In American Print Works v. Lawrence (1850), the New Jersey Supreme Court held that police powers include the authority to destroy buildings to prevent the spread of a fire. In the Slaughterhouse Cases (1872), the U.S. Supreme Court upheld a New Orleans law requiring slaughterhouses to move to the outskirts of the city to maintain cleanliness and health.
The Tenth Amendment to the U.S. Constitution reserves powers not delegated to the federal government to the states or the people. The Supreme Court has ruled that Congress has limited power to enact legislation and that federal laws take precedence over state laws in certain areas, especially those affecting interstate commerce.

























