In investigating Dow Chemical Company for possible violations of the Clean Air Act, the Environmental Protection Agency caused aerial photographs of Dow’s 2000-acre Midland, Michigan plant to be made by a private aerial survey company. Upon learning of the EPA flyover, Dow sought declaratory and injunctive relief in the United States District Court for the Eastern District of Michigan. On cross-motions for. partial summary judgment, the District Court held that EPA’s detailed aerial photography was an unreasonable search and seizure under the Fourth Amendment. The District Court,
I.
The EPA began an investigation of Dow’s Midland, Michigan plant during the latter part of 1977. The investigation focused on whether emissions from two coal- *310 burning power houses violated the federal air quality standards established under the Clean Air Act.
On September 9, 1977, EPA made an on-site inspection of Dow’s power plants. EPA later requested and received from Dow schematic drawings depicting both the physical layout of the power houses and the boilers and turbines within the power houses. EPA then called Dow to arrange a second inspection. Dow refused to grant entry for this inspection upon hearing that EPA inspectors planned to take photographs of the plant. After being denied entry, EPA informed Dow that it would consider seeking a search warrant to gain access to the plant.
EPA did not secure a warrant; instead, on February 6, 1978, EPA contracted with Abrams Aerial Survey Corporation, a private company located in Lansing, Michigan, to take aerial photographs of the Dow plant. EPA’s stated purposes for the aerial surveillance were to create visual documentation of smokestack emissions and to obtain perspectives on the layout of the plant and its relationship to the surrounding geographic area. EPA directed Abrams to take the pictures at particular altitudes and angles; EPA informed Abrams that emissions would be more visible in early morning or late afternoon, but left the actual time of the flight to Abrams’ discretion.
Abrams performed the overflight in the afternoon on February 7, 1978. The aircraft made at least six passes over the plant at altitudes of 12,000, 3,000, and 1,200 feet. Abrams used a Wild RC-10 aerial mapping camera to take approximately 75 color photographs of various parts of the Dow plant. Because of Abrams’ sophisticated photographic equipment, the photographs contain vivid detail and resolution; some of the photographs can be enlarged to a scale of 1 inch equals 20 feet or greater, without significant loss of detail or resolution. The District Court found that when enlarged in this manner and viewed under magnification, the photographs show equipment, pipes and power lines as small as ½ inch in diameter.
EPA did not notify Dow either before or after the flight. When Dow learned of the event a few weeks later, from sources other than EPA, Dow filed this action.
The District Court reasoned that once it is established that an administrative search occurred, “[t]he question [turned] on whether EPA’s authority under the Clean Air Act meets ‘the sufficiently comprehensive and defined’ criteria of
Donovan v. Dewey
... or whether the search violated a reasonable expectation of privacy.”
Although the Court “[was] fairly certain that the Fourth Amendment issue raised in this case is properly resolved on the basis of an administrative inspection analysis alone,”
*311 Lastly, the District Court held that the Clean Air Act did not authorize EPA to institute aerial surveillance of chemical plants. Hence, by conducting such surveillance, EPA exceeded its statutory authority under the Act.
Therefore, two questions are presented by this appeal. First, we must decide the constitutional issue of whether there was an unreasonable search under the Fourth Amendment. Second, did EPA exceed its statutory authority under the Clean Air Act by conducting the aerial photography?
II.
The Fourth Amendment provides for “people to be secure in their persons, houses, papers and effects against unreasonable searches ... and [that] no warrant shall issue but upon probable cause....” U.S. Const, amend. IV. The U.S. Supreme Court held nearly twenty years ago that these protections apply, at least in part, when a governmental agency conducts an administrative search of a commercial facility.
Camara v. Municipal Court,
The issue of whether there was a search is a threshold requirement of Fourth Amendment analysis. To be entitled to Fourth Amendment protection, it is first necessary to determine whether there was a “search,” a term of art with special constitutional significance. Traditionally, in defining what constituted a search, the Supreme Court interpreted the Fourth Amendment as primarily protective of property rights; a trespass was a necessary condition for determining whether a search had occurred.
See Olmstead v. United States,
Before applying the
Katz
analysis to this case, it is important to note that the word “reasonable” is used in Fourth Amendment analysis in two different ways, and that these two ways must be separated in order to avoid confusion. A “reasonable search” is different from a “reasonable expectation of privacy.” The former refers to whether “probable cause” existed or whether the officers exceeded the limits of the warrant. The latter determines whether there was a Fourth Amendment “search” at all and focuses on whether the human relationships that normally exist at the place inspected are based on intimacy, confidentiality, trust or solitude and hence give rise to a “reasonable” expectation of privacy. The District Court may have confused or conflated these two when it stated that it “[was] fairly certain that the Fourth Amendment issue raised in this case is properly resolved on the basis of an administrative inspection analysis alone” without reference to an analysis under
Katz.
III.
Establishing an actual expectation of privacy requires two elements. First, it must be established what a person had an expectation of privacy in, for example, a home, office, phone booth or airplane. Second, it must be established what the person wanted to protect his privacy from, for example, non-family members, non-employees of a firm, strangers passing by on the street or flying overhead in airplanes. The New York Stock Exchange, a place which illustrates the two types of expectations, permits only members and employees on the floor but welcomes the public observer from above.
A useful test of whether a person has a privacy interest in a certain place is whether there are any “objective manifestations of any claimed privacy expectation.”
Dow Chemical Co. v. United States,
Here Dow had an actual expectation of privacy in certain parts of its plant, privacy which included the freedom from certain kinds of intrusion. Dow took great pains to be free from ground level intrusion by building a perimeter security fence and employing security guards.
IV.
We are not convinced that Dow had an actual expectation of privacy from the air, but even if Dow did have such an expectation the expectation was unreasonable. On this question, the District Court erred in dismissing defendant’s “open field” argument. Dow’s Midland plant is 2000 acres, located in an urban area near an airport and within the pattern of planes landing and taking off. Both the size and location of an entity must be taken into account in order to determine whether it is objectively reasonable to expect privacy in all or part of that entity. Dow’s size and location militate against regarding an expectation of privacy free from aerial observation as reasonable. When the entity observed is a multi-building complex, and the area observed is the outside of these buildings and the spaces in between the buildings, and when the complex is near an airport and within the pattern of planes landing and taking off, it is difficult to see how a reasonable person would have privacy expectations in the outside of the buildings and the spaces between the buildings.
Although the analogy is not perfect, Dow’s Midland plant is much more like “open fields” than it is a home or office. When the area observed is like an open field, an inspection which would otherwise be a search becomes a non-search for Fourth Amendment purposes.
Hester v. United States,
The Fourth Amendment and other laws protecting privacy create the conditions and the context for many relationships based on intimacy, friendship and trust. These laws establish an environment in which individual emotional and mental processes can develop freely without surveillance or interference. The legal principles that protect privacy, therefore, do not protect the desert island, the mountain top or the open field — even one the owner has posted with a “no trespass” sign. The human relations that create the need for privacy do not ordinarily take place in these settings. The only significant interest at stake here — a property owner’s interest in excluding others from his possessions — is not sufficient alone to bring into play legal principles protecting privacy.
United States v. Oliver,
It is true that certain outside areas associated with a home or dwelling have traditionally received Fourth Amendment protection as falling within the “curtilage.” Thus, the Fourth Amendment has been held to apply to the search of a smokehouse located within a fenced yard,
see Robertson v. United States,
It can be argued here that the areas in between Dow’s buildings formed a sort of industrial curtilage, and therefore should receive Fourth Amendment protection. However, to apply the curtilage doctrine to this 2000-acre manufacturing complex would be a distortion of the principles on which the doctrine rests. The doctrine of curtilage is grounded in the peculiarly strong concepts of intimacy, personal autonomy and privacy associated with the home. The home is fundamentally a sanctuary, where personal concepts of self and family are forged, where relationships are nurtured and where people normally feel free to express themselves in intimate ways. The potent individual privacy interests that inhere in living within a home expand into the areas that enclose the home as well. The backyard and area immediately surrounding the home are really extensions of the dwelling itself. This is not true simply in a mechanical sense because the areas are geographically proximate. It is true because people have both actual and reasonable expectations that many of the private experiences of home life often occur outside the house. Personal interactions, daily routines and intimate relationships revolve around the entire home place. There are compelling reasons, then, for applying Fourth Amendment protection to the entire dwelling area.
Dow has legitimate privacy interests in many aspects of its corporate life. Dow has strong expectations of privacy within its offices and inside its enclosed facilities. These interests are not so powerful that they automatically apply to the exterior of Dow’s plant. In the home setting, Fourth Amendment protection applies to adjoining areas because of the unique privacy interests associated with dwelling places, and because of our traditional understanding that home life is not confined to the physical structure of the house. The areas between industrial buildings do not normally share the same uses.
Although Dow has a reasonable expectation of privacy in the interior of its plant buildings and offices, this is not to say that such a privacy interest has equal force to that which inheres in a dwelling. Indeed, the Court’s ruling in
Marshall v. Barlow’s, Inc., supra,
that a lesser showing of probable cause is required to secure an administrative warrant, is evidence of this difference. The Court has noted that a commercial owner’s privacy interest “differs significantly from the sanctity accorded an individual’s home.”
Donovan v. Dewey,
y.
Finally, much is made of the government’s use of sophisticated photographic equipment from the air. The District Court found that such sophisticated technology violated Dow’s Fourth Amendment rights because the extreme detail of the photographs enabled a viewer to observe “more than the human eye could ever see.”
The government conducts a search when it uses “enhanced viewing of the interior of a home,” because it impairs “a legitimate expectation of privacy and encounters the Fourth Amendment’s warrant requirement.”
United States v. Taborda,
VI.
The District Court also erred in upholding Dow’s contention that EPA’s use of enhanced aerial observation as an inspection technique exceeded the agency’s authority under the Clean Air Act. The District Court held that section 114 of the Clean Air Act, 42 U.S.C. § 7414, does not authorize aerial photography as an investigatory tool “even by reasonable implication.”
Although the statute does not expressly authorize enhanced aerial observation, the language of section 114 clearly does not foreclose this technique. Congress has delegated general investigative authority to EPA under the Clean Air Act. EPA investigators may go to the library to research a company, talk to its employees and former employees and observe the plant from different vantage points without making an “entry” on the premises which requires notification. Other law enforcement officers who use aerial observation in their work, e.g., drug enforcement and traffic officers, coast guard and property tax mapping officials, do not have to announce their presence in advance or present credentials. Like these officers, EPA investigators should be permitted to use aerial photography as a part of their general investigative authority. Congress need not expressly delegate this authority to EPA just as it need not expressly delegate it to the FBI or the DEA or to military investigators. So long as these investigators operate in the public air space and do not intrude into areas protected by the Fourth Amendment, they may use an airplane and a camera without presentation of credentials to the owners of property over which they fly.
Accordingly, the judgment of the District Court is reversed. Costs are assessed against appellee.
Notes
. Exceptions to the
Barlow’s
administrative warrant requirement have been made in industries like the alcoholic beverage industry, which has long been "subject to close supervision and inspection.”
Colonnade Corp. v. United States,
. Our reasoning in this regard is similar to that of the Ninth Circuit in
United States v. Alien,
