476 U.S. 227 (1986)
Dow Chemical Company operates a 2,000-acre chemical manufacturing facility in Midland, Michigan, consisting of covered buildings with manufacturing equipment and piping conduits exposed between them.1 The company maintains elaborate security around the perimeter to bar ground-level public views and investigates low-level flights, but has not covered the exposed equipment because the cost would be prohibitive.2
In early 1978, Environmental Protection Agency officials, with Dow's consent, inspected two powerplants at the facility.3 After Dow denied a request for a second inspection and EPA did not seek a search warrant, the agency hired a commercial aerial photographer who used a floor-mounted precision aerial mapping camera to take photographs from altitudes of 12,000, 3,000, and 1,200 feet while flying in navigable airspace.4
Upon learning of the photography from an independent source, Dow filed suit in the United States District Court for the Eastern District of Michigan, claiming the action violated the Fourth Amendment and exceeded EPA's statutory authority under the Clean Air Act.5 The District Court granted summary judgment to Dow and permanently enjoined EPA from taking or disseminating aerial photographs of the premises.6
The Court of Appeals for the Sixth Circuit reversed the District Court's judgment.7 The Supreme Court granted certiorari to review the Court of Appeals' determinations on EPA's statutory authority and the Fourth Amendment issue.8
Whether the Environmental Protection Agency exceeded its statutory authority under the Clean Air Act by conducting aerial photography of Dow Chemical Company's manufacturing facility?9
When Congress invests an agency with enforcement and investigatory authority, it is not necessary to identify explicitly each and every technique that may be used in the course of executing the statutory mission.10 Regulatory or enforcement authority generally carries with it all the modes of inquiry and investigation traditionally employed or useful to execute the authority granted.11
No. The Environmental Protection Agency acted within its authority under 42 U.S.C. § 7414(a) when it hired a commercial aerial photographer to take pictures of Dow Chemical Company's facility from navigable airspace.12 The statute grants EPA a right of entry and access to inspect, and this authority includes methods of observation commonly available to the public such as aerial photography from aircraft lawfully in public airspace.13
The Environmental Protection Agency did not exceed its statutory authority under the Clean Air Act.14
Whether the aerial photography of Dow Chemical Company's 2,000-acre plant complex from navigable airspace without a warrant constituted a search under the Fourth Amendment?15
The taking of aerial photographs of an industrial plant complex from navigable airspace is not a search prohibited by the Fourth Amendment.16 The open areas of an industrial plant complex with numerous plant structures spread over an area of 2,000 acres are not analogous to the 'curtilage' of a dwelling for purposes of aerial surveillance.17
No. Dow Chemical Company conceded that naked-eye observation from the air would not be a search, and the use of a conventional aerial mapping camera from public airspace did not reveal intimate details or penetrate buildings.18 The facility's exposed areas are comparable to open fields for aerial observation purposes.19
The aerial photography did not constitute a search under the Fourth Amendment.20
Related opinions on this issue
Joined by Justices Brennan, Marshall, And Blackmun
Justice Powell, joined by Justices Brennan, Marshall, and Blackmun, dissented in part from the Fourth Amendment ruling.21 He contended that the majority retreats from the Katz standard by focusing on the manner of surveillance rather than the privacy interest itself.22 Powell emphasized that Dow had taken elaborate precautions to protect its trade secrets from aerial observation.23
The sophisticated camera used captured details that the naked eye could not see, thereby intruding on a reasonable expectation of privacy without obtaining a warrant.24
Whether Dow Chemical Company's industrial plant complex qualifies for Fourth Amendment protection equivalent to curtilage rather than an open field in the context of aerial observation?25
The intimate activities associated with family privacy and the home and its curtilage simply do not reach the outdoor areas or spaces between structures and buildings of a manufacturing plant.26 To fall within the 'open fields' doctrine the area need be neither 'open' nor a 'field' as those terms are used in common speech.27
No. Although Dow Chemical Company maintained elaborate security to bar ground-level views of its 2,000-acre facility, the outdoor manufacturing equipment and piping between buildings do not involve the intimate activities of home life that curtilage protects.28 The complex is more comparable to an open field for purposes of aerial surveillance from navigable airspace.29
Dow Chemical Company's industrial plant complex does not qualify for Fourth Amendment protection equivalent to curtilage in the context of aerial observation.30
Whether the use of a precision aerial mapping camera to photograph an industrial facility from public airspace implicates Fourth Amendment protections?31
The mere fact that human vision is enhanced somewhat, at least to the degree here, does not give rise to constitutional problems.32 It may well be that surveillance of private property by using highly sophisticated surveillance equipment not generally available to the public, such as satellite technology, might be constitutionally proscribed absent a warrant, but the photographs here are not so revealing of intimate details as to raise constitutional concerns.33
No. The precision aerial mapping camera employed by the Environmental Protection Agency was a standard commercial camera commonly used in mapmaking.34 The resulting photographs provided only an outline of buildings and equipment without capturing identifiable human faces or secret documents.35 Any magnification did not reveal details that would implicate serious privacy concerns beyond what is observable from public airspace.36
The use of a precision aerial mapping camera to photograph an industrial facility from public airspace does not implicate Fourth Amendment protections.37