Airspace

In 2006, Detective William Pedraja of the Miami-Dade Police Department received an unverified tip that marijuana was being grown in the home of respondent Joelis Jardines. One month later, the Department and the Drug Enforcement Administration sent a joint surveillance team to Jardines' home. Detective Pedraja watched the home for fifteen minutes and saw no vehicles in the driveway or activity around the home, and could not see inside because the blinds were drawn. Detective Pedraja then approached Jardines' home accompanied by Detective Douglas Bartelt, a trained canine handler who had just arrived at the scene with his drug-sniffing dog. The dog was trained to detect the scent of marijuana, cocaine, heroin, and several other drugs, indicating the presence of any of these substances through particular behavioral changes recognizable by his handler. Detective Bartelt had the dog on a six-foot leash, owing in part to the dog's wild nature and tendency to dart around erratically while searching. As the dog approached Jardines' front porch, he apparently sensed one of the odors he had been trained to detect, and began energetically exploring the area for the strongest point source of that odor by tracking back and forth. After sniffing the base of the front door, the dog sat, which is the trained behavior upon discovering the odor's strongest point. Detective Bartelt then pulled the dog away from the door and returned to his vehicle, informing Detective Pedraja that there had been a positive alert for narcotics. On the basis of what he had learned at the home, Detective Pedraja applied for and received a warrant to search the residence. When the warrant was executed later that day, Jardines attempted to flee and was arrested; the search revealed marijuana plants, and he was charged with trafficking in cannabis. At trial, Jardines moved to suppress the marijuana plants on the ground that the canine investigation was an unreasonable search. The trial court granted the motion, and the Florida Third District Court of Appeal reversed. On a petition for discretionary review, the Florida Supreme Court quashed the decision of the Third District Court of Appeal and approved the trial court's decision to suppress. The United States Supreme Court granted certiorari, limited to the question of whether the officers' behavior was a search within the meaning of the Fourth Amendment.

In 1986, petitioner David H. Lucas purchased two residential lots on the Isle of Palms in Charleston County, South Carolina, for $975,000. He intended to construct single-family homes on the parcels, which at the time were zoned for such use and required no building permit for development. No portion of the lots qualified as a critical area under then-existing coastal zone legislation. Subsequently, in 1988, the South Carolina Legislature enacted the Beachfront Management Act. The legislation established a baseline and prohibited construction of occupable improvements seaward of a line drawn 20 feet landward of that baseline, directly affecting Lucas's parcels by barring any permanent habitable structures. Lucas filed an action in the Court of Common Pleas alleging that the Act's restrictions effected a taking of his property without just compensation. Following a bench trial, the court determined that the prohibition rendered the lots valueless and ordered the state to pay just compensation in the amount of $1,232,387.50. The Supreme Court of South Carolina reversed the trial court's judgment. It accepted the legislature's findings that new construction threatened public resources and concluded that a regulation designed to prevent serious public harm could not constitute a taking. The United States Supreme Court granted certiorari to review the South Carolina Supreme Court's decision.

In 1966 the Pennsylvania Legislature enacted the Bituminous Mine Subsidence and Land Conservation Act to address land subsidence caused by underground coal mining. The Act authorizes the Department of Environmental Resources to implement and enforce a comprehensive program preventing or minimizing subsidence and consequent damage to surface structures. Section 4 prohibits mining that causes subsidence damage to public buildings, dwellings used for human habitation, and cemeteries, and generally requires that 50 percent of the coal beneath such structures remain in place to provide surface support. Petitioners are an association of coal producers and several of its member corporations engaged in underground bituminous coal mining in western Pennsylvania. They own, lease, or control substantial coal reserves and associated support estates beneath surface properties affected by the Subsidence Act. Many of these interests were severed from the surface estate between 1890 and 1920, and petitioners or their predecessors typically acquired waivers of liability for subsidence damage along with rights to deposit wastes, provide drainage and ventilation, and erect surface facilities. In 1982 petitioners filed a civil rights action in the United States District Court for the Western District of Pennsylvania against the Secretary of the Department of Environmental Resources and other officials. They sought to enjoin enforcement of the Subsidence Act and its implementing regulations, alleging that Section 4 and Section 6 effected a taking of their property without compensation and that Section 6 impaired their contractual obligations. The parties entered a stipulation of facts concerning the facial challenge and filed cross-motions for summary judgment. The District Court granted summary judgment in favor of the Department officials. The Court of Appeals for the Third Circuit affirmed. The Supreme Court granted certiorari to consider the constitutional challenges to the Subsidence Act. Petitioners have never claimed that the Subsidence Act makes it commercially impracticable for them to continue mining their bituminous coal interests in western Pennsylvania, nor have they identified any specific mine rendered unprofitable by the statute. The evidence in the record shows that enforcement of the 50 percent rule has required petitioners to leave less than 27 million tons of coal in place. This applies across 13 mines containing over 1.46 billion tons. It amounts to less than 2 percent of the total coal in those operations.

Respondents Thomas Lee Causby and his wife purchased 2.8 acres of land near an airport outside Greensboro, North Carolina in 1934. The property included a dwelling house and outbuildings used for raising chickens. The end of the airport's northwest-southeast runway was 2,220 feet from the barn and 2,275 feet from the house, and the glide path passed over the property at 83 feet above the ground. In April 1942 the airport was taken over by the Greensboro-High Point Municipal Airport Authority. In May 1942 the United States leased the airport for military operations beginning June 1, 1942, with the lease renewable until 1967 or the end of the national emergency. Military planes including four-motored heavy bombers used the northwest-southeast runway about four percent of the time for takeoffs and seven percent for landings, frequently flying low over the Causbys' land and buildings. The flights caused the chickens to become frightened, resulting in the loss of approximately 150 birds that flew into walls, a decline in egg production, and the eventual destruction of the commercial chicken business. The noise and glare from the planes also deprived the family of sleep and caused them to become nervous and frightened. Although no accidents occurred on the property, several happened nearby. The Causbys brought suit in the Court of Claims, which found that their property had depreciated in value due to the flights and entered judgment for them in the amount of $2,000. The Supreme Court granted a petition for a writ of certiorari to consider the case.