Also known as:police power · police powers doctrine · state police power
Written by attorneys — see sources below.
The inherent authority of states to enact laws and regulations protecting the public health, safety, morals, and general welfare. This power is reserved to the states by the Tenth Amendment and supports measures such as zoning, compulsory vaccination, and land-use controls when the classification is reasonable and substantially related to those public purposes.
See Our Sources
How its tested
Common Examples
6
Zoning Districts Upheld
Patricia Patel owns a parcel she wants to develop for industrial use. The city enacts a comprehensive zoning ordinance that places her land in a residential district. The ordinance is sustained because the districting classification bears a substantial relation to public health and general welfare.
Gun Possession Near School
Parker Phillips, a local student, brings a firearm to school. Congress criminalizes the conduct under the Commerce Clause. The statute exceeds federal authority because the purely local, non-economic possession falls within traditional state police powers rather than interstate commerce.
In March 1992, Alfonso Lopez, Jr., a twelfth-grade student at Edison High School in San Antonio, Texas, arrived at school carrying a concealed .38-caliber handgun and five bullets. Acting on an anonymous tip, school authorities confronted Lopez, who admitted possessing the weapon. Local police arrested him and charged him under Texas law with firearm possession on school premises.
The following day, state charges were dismissed after federal agents charged Lopez with violating the Gun-Free School Zones Act of 1990. A federal grand jury indicted him on one count of knowing possession of a firearm at a school zone. Lopez moved to dismiss the indictment, arguing that the statute exceeded Congress's power to legislate control over public schools.
The district court denied the motion, concluding that the statute was a constitutional exercise of Congress's power to regulate activities affecting commerce because the business of schools affects interstate commerce. After a bench trial, the court found Lopez guilty and sentenced him to six months' imprisonment and two years of supervised release.
Lopez appealed to the Court of Appeals for the Fifth Circuit, which reversed the conviction, holding that the statute was beyond Congress's power under the Commerce Clause. The Supreme Court granted certiorari to review the case.
Perry Pratt, a bakery owner, challenges a state law limiting employee hours. The statute is struck down because it interferes with liberty of contract without a sufficient connection to public health under the police power.
Lochner v. New York198 U.S. 45 (1905)
The New York legislature passed a labor law in 1897 that regulated bakeries and confectionery establishments.
Section 110 of article 8 of that law stated that no employee shall be required or permitted to work more than sixty hours in any one week or more than ten hours in any one day.
This applied unless for the purpose of making a shorter work day on the last day of the week.
The plaintiff in error violated the one hundred and tenth section of article 8, chapter 415, of the Laws of 1897, known as the labor law of the State of New York, in that he wrongfully and unlawfully required and permitted an employe working for him to work more than sixty hours in one week. The charge arose from a voluntary contract rather than any use of physical force.
The judgments of the County Court of Oneida County, the Supreme Court, and the Court of Appeals of New York upheld the conviction under the statute, although several judges dissented. The record indicated that the state courts had viewed the law as a measure relating to public health.
The case came before the Supreme Court of the United States after argument on February 23 and 24, 1905. The Court rendered its decision on April 17, 1905.
Pinnacle Holdings owns land needed for a city street widening. The city condemns a strip to promote public safety. The action is upheld as a valid exercise of eminent domain authority even though compensation is required.
Chicago, Burlington & Quincy Railroad Co. v. City of Chicago166 U.S. 226, 239, 17 S.Ct. 581, 585, 41 L.Ed. 979 (1897)
The City of Chicago, acting under an 1872 Illinois statute that became part of its charter in 1875, passed an ordinance on October 9, 1880, to open and widen Rockwell Street from West 18th Street to West 19th Street by condemning parcels of land owned by individuals and parts of the right of way of the Chicago, Burlington and Quincy Railroad Company within the city limits.
On November 12, 1890, the city filed a petition in the Circuit Court of Cook County seeking condemnation of the property and asking that just compensation be ascertained by a jury, with the railroad company admitted as a defendant along with other interested parties. The jury awarded one dollar as just compensation to the railroad company for the parts of its right of way to be used for the street, while awarding compensation to individual owners for their parcels.
The railroad moved for a new trial, which was overruled, and final judgment was entered in execution of the award. The judgment was affirmed by the Supreme Court of Illinois in 149 Illinois 457. After affirmance the railroad company sued out a writ of error to the United States Supreme Court.
The railroad had raised claims under the Fourteenth Amendment in its motion for new trial and in its assignment of errors filed in the state supreme court. The Illinois statute provided no provision for an answer by defendants in condemnation proceedings, but the railroad asserted its federal claims in the written motion to set aside the verdict and grant a new trial.
Portia Price lives with her grandchildren in a single-family zone. The city ordinance limits households to nuclear families. The restriction is invalidated because it bears no rational relation to the city's asserted interests in density and traffic control.
Moore v. City of East Cleveland, Ohio431 U.S. 494, 503 (1977)
In early 1973, Mrs. Inez Moore received a notice of violation from the city of East Cleveland. The notice stated that her grandson John Moore, Jr., was an illegal occupant of her home. It directed her to comply with the housing ordinance.
Mrs. Moore lived in her East Cleveland home together with her son Dale Moore, Sr., and her two grandsons Dale Moore, Jr., and John Moore, Jr. John came to live with her after his mother's death when he was less than one year old. When she failed to remove John from the home, the city filed a criminal charge against her.
Mrs. Moore moved to dismiss the charge. She claimed that the ordinance was constitutionally invalid on its face. Her motion was overruled. Upon conviction she was sentenced to five days in jail and a $25 fine.
The East Cleveland ordinance limited occupancy of a dwelling unit to members of a single family. The ordinance defined family to include only a husband or wife of the nominal head of the household, unmarried children of the head or spouse provided they have no children residing with them, a parent of the head or spouse, or not more than one dependent child of the head or spouse along with that child's spouse and dependent children.
The Ohio Court of Appeals affirmed the conviction after giving full consideration to her constitutional claims. The Ohio Supreme Court denied review of the case. The United States Supreme Court noted probable jurisdiction of her appeal.
Pamela Phillips owns waterfront property targeted for a private redevelopment plan. The city condemns the land to transfer it to a developer. The taking is sustained because the project serves a public purpose under the Takings Clause.
Kelo, et al. v. City of New London545 U.S. 469, 503 (2005)
In the late 1990s the city of New London, Connecticut, confronted severe economic decline after the 1996 closure of the Naval Undersea Warfare Center, which had employed more than 1,500 people. The city's unemployment rate stood nearly double the state average and its population had dropped below 24,000 residents from a 1970 high of 30,000. State and local officials therefore designated the Fort Trumbull peninsula for targeted economic revitalization.
In 1998 the New London Development Corporation, a private nonprofit entity, was reactivated to prepare a redevelopment plan covering roughly 90 acres. The plan divided the area into seven parcels designated for a waterfront conference hotel and marinas, retail and entertainment space, research and office facilities, parking and park support, residential units, a Coast Guard museum, and additional office and retail uses. The city council formally approved the plan in January 2000 and authorized the NLDC to acquire needed parcels by purchase or, if necessary, by eminent domain.
Petitioners Susette Kelo, Wilhelmina Dery, and seven other owners held fifteen properties within parcels 3 and 4A; ten of those parcels were occupied by the owners or their family members and none was alleged to be blighted. After negotiations with the NLDC failed, the corporation initiated condemnation proceedings against the remaining properties in November 2000.
In December 2000 the petitioners filed suit in New London Superior Court asserting that the proposed takings violated the public-use limitation of the Fifth Amendment. Following a seven-day bench trial the Superior Court entered a permanent restraining order barring condemnation of the parcel 4A properties but denied relief as to the parcel 3 properties.
Both sides appealed to the Connecticut Supreme Court, which upheld the validity of all challenged takings. The United States Supreme Court granted certiorari to review the federal constitutional question.
What ends may states pursue under their police powers?
States may regulate to protect public health, safety, morals, and general welfare. These ends are broad and include zoning, vaccination requirements, and land-use controls when reasonably related to those purposes.
Supporting sources
How does the police power interact with the Contracts Clause?
A state cannot bargain away its police power. Legislation that retroactively impairs existing private contracts violates the Contracts Clause even if framed as a consumer-protection measure under the police power.
Supporting sources
When does federal legislation displace state police powers?
Federal statutes do not displace traditional state police powers unless Congress clearly manifests that intent. Courts presume states retain authority over health, safety, and land use absent clear preemption.
Supporting sources
438 U.S. 104, 98 S.Ct. 2646, 57 L.Ed.2d 631 (1978)
…that the property be put to its most profitable use. The terminal is a historic landmark and the law is a valid exercise of the police power to protect the public interest in such landmarks. Pp. 135-138. Majority opinion Opinion of Justice Brennan The question presented is whether a city may, as part of a comprehensive…