Opinion
The Peopleappeal an order dismissing criminal proceedings against Ronald Lee Sabo and Angela Marie Zizzo (respondents) after the
*847
court sustained their motions to suppress evidence seized in a search authorized by a warrant issued following a helicopter flight observation of marijuana growing in a backyard greenhouse. Distinguishing
California
v.
Ciraolo
(1986)
I
Sabo and Zizzo lived together in a residence on El Capitan Drive in La Mesa, California. During a routine helicopter patrol mission, Deputy Sheriff Wilson observed what he believed to be marijuana plants growing inside a 15 by 20 foot greenhouse located in the backyard, directly west of respondents’ house. Deputy Larry Martin of the narcotics squad then joined Wilsоn in the helicopter.
Hovering at 400-500 feet, Martin saw the greenhouse. Several roof and side panels were missing. A tall pine tree and heavy vegetation inhibited a direct view into the structure. However, as Wilson circled the helicopter, Martin was able to see marijuana plants growing inside the greenhouse.
Based on Martin’s information, a search warrant issued and sheriff’s deputies found marijuana in the greenhouse. The court granted respondents’ motion to suppress the seized marijuana, holding the aerial surveillance violated their Fourth Amendment rights, and dismissed the action.
II
At the suppression hearing, the People argued the motion should be denied because aerial overflights and observations do not violate a person’s legitimate privacy expectation, Deputies Martin and Wilson were in a public place oрen to their use at the time of the search, respondents’ curtilage is not a protected area, and respondents’ expectation the police would not see the marijuana growing in their greenhouse is unreasonable. The court granted the motion, finding: “The area searched (greenhouse) was within the defendant’s curtilage. A reasonable expectation of privacy existed. A warrantless ovеrflight constituted an unreasonable search in violation of the Fourth Amendment. The fruits of that unconstitutional search cannot support a warrant.”
The court’s finding was based on
People
v.
Ciraolo
(1984)
Following oral argument on this appeal, the Supreme Court issued its opinion May 19, 1986, in
California
v.
Ciraolo, supra,
A.
Ciraolo
reaffirms the standard of Fourth Amendment analysis set forth in
Katz
v.
United States
(1967)
In
Ciraolo,
the Supreme Court found, and the state did not challenge, the defendant clearly had manifested his subjective intent and desire to maintain privacy as to his “unlawful agricultural pursuits”
(ibid.).
The high court noted: “It can reasonably be assumed that the 10-foot fence was placed to conсeal the marijuana crop from at least street level views. So far as the normal sidewalk traffic was concerned, this fence served that purpose, because [defendant] ‘took normal precautions to maintain his privacy.’ [Citation.]” (Cir
aolo, supra,
at p. — [
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Ciraolo
then turns to the second inquiry, whether the expectation of privacy is reasonable. After concluding the yard in
Ciraolo
was part of the curtilage, the high court commented the Fourth Amendment has never been extended “to require law enforcement officers to shield their eyes when passing by a home on public thoroughfares ...”
(id.
at p. — [
We examine the facts in our case.
B.
As in Ciraolo, the facts here satisfy the first Katz inquiry: the respondents had a subjective expectation of privacy in their greenhouse within the curtilage. We turn to the second, the reasonableness of their expectation of privacy.
In Ciraolo, the marijuana growing in the backyard was clearly visible to the naked eye peering from a fixed wing aircraft flying at a 1,000-foot altitude. While the fenced yard effectively shielded the marijuana from the view of the earthbound constable, as well as that of the casual passerby, the eye in the sky is not so inhibited.
“In an age where private and commercial flight in the public airways is routine, it is unreasonable for respondent to expect that his marijuana plants were constitutionally protected from being observed with the naked eye from an altitude of 1,000 feet. The Fourth Amendment simply does not require the police traveling in the public airways at this altitude to obtain a warrant in order to observe what is visible to the naked eye.”
(Ciraolo, supra,
at p. — [
There are factual differences. Ciraolo has a fenced backyard open to the skies; marijuana easily visible to an observer from a fixed wing aircraft flying at 1,000 feet in navigable airspace. Here, the greenhoused marijuana was visible only to an eye in a circling helicoptеr positioned such as to enable a peek at the pot through the gaps.
Respondents argue these factual differences demonstrate a reasonable expectation of privacy, contending
Dow Chemical Co.
v.
United States
(1986)
We find the suggestion the
Dow
footnote limits the broad sweep of
Ciraolo
not persuasive. First, the Supreme Court concluded in
Dow
the enclosed plant complex “does not fall precisely within the ‘open fields’ doctrine. The area at issue here can perhaps be seen as falling somewhere between ‘open fields’ and curtilage, but lacking some of the critical characteristics
*851
of both.”
(Id.
at p. — [
While the naked-eye observation of marijuana growing in an open backyard from Ciraolo’s fixed wing aircraft flying at 1,000 feet on a straight and narrow course in navigable airspace does not violate a reasonable expectation of privacy, respondents assert a helicopter hovering at 400 feet, positioned to peer through gaps in a roof, intrusively invades and impermissibly violates a reasonable expectation of privaсy.
Ciraolo, supra,
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Dow,
concluding the open area of the industrial plant complex with numerous plant structures over an area of 2,000 acres is comparable to an open field, holds that complex “is оpen to the view and observation of persons in aircraft lawfully in the public airspace immediately above or sufficiently near the area for the reach of cameras”
(Dow, supra,
at p. — [
Clearly, Ciraolo and Dow authenticate aerial surveillance taken within navigable airspaсe. There is a public right of freedom of transit through the navigable airspace of the United States. (49 U.S.C. § 1304.) Navigable airspace is that airspace above the minimum altitudes of flight prescribed by regulations issued by the Civil Aeronautics Board. (49 U.S.C. § 1301(29).) The minimum altitude for a fixed wing aircraft over a congested area is 1,000 feet and 500 feet above the surface in an area other than a congested area. Over open wаter or in sparsely populated areas, an aircraft may not be operated closer than 500 feet to any person, vessel, vehicle or structure (14 C.F.R. § 91.79(b) & (c) (1986)).
Helicopters may be operated at less than the minimum applicable to aircraft if the operation is conducted “without hazard to persons or property on the surface” (14 C.F.R. § 91.79(d) (1986)).
As we have seen, Ciraolo’s fixed wing aircraft flight observation аt 1,000 feet within the public navigable airspace is not intrusive of privacy. The validated photographs in
Dow
were taken from an aircraft flying at altitudes of 1,200, 3,000 and 12,000 feet, all within navigable airspace.
(Dow, supra,
476 U.S. at p. — [
We judicially notice the unique capabilities of the helicopter to gambol in the sky—turning, curtsying, tipping, hummingbird-like suspended in space, ascending, descending and otherwise confounding its fixed wing brethren doomed to fly straight, turn in caution and glidingly descend. While a helicopter may be lawfully operated in the performance of its various capabilities, i.e., present no hazard to person or property, its usage as a platform for aerial surveillance conducted below minimum flight levels and not in navigable airspace, does not per se validate the search under the Ciraolo-Dow rationale—the view from the aircraft in navigable airspace is not an invasion of a reasonable expectation of privacy.
Those cases carefully posit the observation must be from navigable airspace. They do not address аn aerial surveillance in airspace not dedicated to public use and in which the underlying property owner has interests sufficient to be subject to a compensable taking.
We conclude Ciraolo does not declare a rule to govern aerial surveillance of the curtilage in all circumstances and at any altitude and from any platform. We come reluctantly to this conclusion because of the obvious difficulties it crеates. Our reading of Ciraolo and Dow results in a mechanical application of the rule there announced—the naked-eye view from navigable airspace does not offend the Fourth Amendment, whatever the circumstances of the view. We concede that consideration of aerial surveillance by helicopter outside navigable airspace will again invoke myriad factual variations on the theme аnd require a case-by-case analysis to determine whether the surveillance offends Fourth Amendment precepts. Also, our conclusion creates a two-tiered concept. Ciraolo-Dow governs aerial surveillance conducted within and from navigable airspace. Such surveillance outside navigable airspace continues to call for traditional inquiry into reasonable privacy expectatiоn. This result is not in derogation of Proposition 8 requirements relevant evidence be admitted. Under Ciraolo *854 Dow, such evidence is limited to that acquired from a view had from navigable airspace. Those cases thus do not concern views outside that federal aerial enclave.
Finally, our conclusion recognizes the reality of helicopter aerial surveillance. To say any sighting from a helicopter in non-navigable airspace validates a search warrant sanctions a broad range of aerial acrobatics performed in lawful manner but admittedly intrusive, such as an interminable hovering, a persistent overfly, a treetop observation, all accompanied by the thrashing of the rotor, the clouds of dust, and earsplitting din. Views from navigable airspace are far removed from the situs observed. The lawfully operatеd helicopter need stand back only such distance as not to hazard persons or property. Surely, its subsequent antics are subject to the kind of scrutiny called for by
People
v.
Cook, supra,
On this record, we conclude the helicopter views from non-navigable airspace of the marijuana glimpsed through the missing panels of the greenhouse constituted an unreasonable invasion of respondents’ expectation of privacy, and the seizure of the contraband under the warrant issued pursuant to the helicopter viewing violated respondents’ Fourth Amendment rights.
Affirmed.
Wiener, Acting P. J., and Work, J., concurred.
Appellant’s petition for review by the Supreme Court was denied November 26, 1986.
Notes
People
v.
Cook, supra,
Here, the events occurred after the adoption of Propositiоn 8. Relevant evidence though unlawfully obtained under our Constitution may be excluded only if exclusion is required by the United States Constitution.
(In re Lance W.
(1985)
Justice Powell’s dissent, joined by Justices Brennan, Marshall and Blackmun, asserts the majority holding rests on the proposition a view from navigable airspace of the curtilage is not offensive to the Fourth Amendment: “Respondent contends thаt the police intruded on his constitutionally protected expectation of privacy when they conducted aerial surveillance of his home and photographed his backyard without first obtaining a warrant. The Court rejects that contention, holding that respondent’s expectation of privacy in the curtilage of his home, although reasonable as to intrusions on the ground, was unreasonable as to surveillаnce from the navigable air space. In my view, the Court’s holding rests on only one obvious fact, namely, that the air space generally is open to all persons for travel in airplanes. The Court does not explain why this single fact deprives citizens of their privacy interest in outdoor activities in an enclosed curtilage.”
(Ciraolo, supra,
at p. —[
The courts have considered navigable airspace in the context of eminent domain.
United States
v.
Causby
(1946)
Flights of aircraft at altitudes below 100 feet, between 100 and 500 feet and over 500 feet in navigable airspace and at unspecified altitudes may result in a taking of property. (Annot., Airport Operations or Flight of Aircraft as Constituting Taking or Damaging of Property,
