This appeal presents the question whether Coast Guard officers violated the Fourth Amendment when they made a warrant-less, suspicionless and discretionary daytime boarding of a sailboat on the high seas, entered the below-deck cabin after learning that weapons were stowed there, and then conducted a safety inspection in the cabin.
I
On June 20, 1982, defendants Humphrey, Garbez and Smith were sailing in the north Pacific Ocean aboard the Orea, a thirty-nine foot sailboat. 1 After the Coast Guard cutter Boutwell made visual contact with the Orea, the Boutwell received a radio message from the Orea. The Orea inquired whether a boarding would take place, and asked that the boarding party bring beer with them. The Boutwell responded by radio, inquiring as to the destination of the Orea and informing the Orea that she would be boarded. The Orea reported that she was headed for her home port, San Francisco. The commander of the Boutwell decided to board the Orea for the stated purpose of conducting a routine document and safety inspection. The commander had been alerted to watch for pleasure craft carrying drugs from Asia via the North Pacific and observed that the Orea was riding slightly low in the water. The Orea was boarded without probable cause or even reasonable suspicion that the Orea was either carrying contraband or was in violation of safety or document regulations.
Upon boarding the Orea, Coast Guard Lt. Rutz asked whether any weapons were on board. When Humphrey answered affirmatively, Lt. Rutz asked, “May I see them?” Humphrey led Lt. Rutz below deck, where he took possession of the weapons and unloaded them. Humphrey then invited Lt. Rutz to inspect the fire extinguishers, and after doing so, Lt. Rutz asked to examine the marine sanitation device, which is the bathroom facility in nautical terms. Humphrey told Lt. Rutz that he would have to move some loose sails in order to reach the device. Upon moving the sails, Lt. Rutz discovered some fifty aluminum foil packages with a few scattered seeds and green particles sticking to the outside of the packages. The officer opened the packages and discovered what he believed and a subsequent test proved to be marijuana. At that point, the defendants were arrested. A further search of the Orea led to the discovery of approximately 3100 pounds of marijuana valued at over $3,000,000.
Defendants were indicted under 21 U.S.C. § 955a (1982) for possessing narcotics on a vessel of American registry with the intent to distribute and for conspiracy to do so under 21 U.S.C. § 955c (1982). After the district court denied their motion to suppress the marijuana evidence on the ground that the search of the Orea violated the Fourth Amendment, they were convicted on both the substantive and conspiracy counts following a court trial. All three defendants were convicted on both counts; defendant Smith received thirty months incarceration, defendant Garbez was sentenced to two years, and defendant Humphrey was sentenced to four years.
*746 II
A
The first question we address is whether the Coast Guard’s daytime boarding of the
Orea
for the purpose of conducting a document and safety inspection — as distinguished from the subsequent inspection of the below-rdeck cabin — violated the Fourth Amendment. We hold, principally on the authority of
United States v. Villamonte-Marquez,
In
Villamonte-Marquez,
the Supreme Court considered a suspicionless and warrantless boarding of a sailboat located in a ship channel connecting a designated customs port of entry with the open sea. The boarding was conducted by customs officials for the purpose of a document inspection. Because a simple boarding— limited to the publicly exposed deck area— involves only a minimal intrusion on protected Fourth Amendment interests, the Court said such boardings are to be “judged by balancing [the] intrusion on the individual’s Fourth Amendment interests against [the] promotion of legitimate governmental interests.”
Id.
at 588,
Thus,
Villamonte-Marquez
establishes the balancing test as the standard by which the boarding of the
Orea
must be judged. When we apply the balancing test to the facts of this case, we reach the same result as did the Supreme Court in
Villamonte-Marquez.
3
Initially, the privacy interest invaded by the boarding of the
Orea
is not materially different from the privacy interest evaluated in
Villamonte-Marquez;
both cases involved law enforcement officers entering the publicly exposed deck area of a sailing vessel. The governmental interests in the two cases are factually distinguishable, but in both cases the governmental interest is sufficiently substantial to outweigh the minimal intrusion on protected privacy. Two important governmental interests supported the boarding of the
Orea.
First, there is a substantial governmental interest in enforcing documentation laws on the high seas because the United States is obligated by treaty to enforce documentation laws for United States vessels in international waters.
See Unit
*747
ed States v. Watson,
When we compare the minimal intrusion on protected interests with the strong governmental interest that supported the boarding of the Orea, we conclude, as the Supreme Court did in Villamonte-Marquez, that the boarding itself was “reasonable” and hence did not violate the Fourth Amendment. Our conclusion is highly fact specific. We do not establish a general rule that approves all warrantless, suspicionless, and discretionary boardings of noncommercial vessels on the high seas. ■Rather, we hold that a daytime boarding for the purpose of conducting a safety inspection that is conducted in a minimally intrusive manner, when the vessel is in a location that poses a substantial risk to its occupants, is reasonable under the Fourth Amendment balancing test. No broader conclusion is required to decide this case.
Our conclusion is consistent with this court’s precedent. Before
VillamonteMarquez,
it would have been an open question whether the boarding of the
Orea
violated the Fourth Amendment. Our court had approved a brief detention in territorial waters when there was cause in the form of a visible safety hazard,
United States v. Odneal,
Our holding today — that under some circumstances the Coast Guard may conduct warrantless and suspicionless boardings for the purpose of conducting document and safety inspections on the high seas — is supported by the decisions of our sister *748 circuits. The First, 5 Fifth 6 and Eleventh 7 Circuits have all held that warrantless and suspicionless boardings for the purpose of conducting document and safety inspections do not violate the Fourth Amendment even in the absence of an administrative plan. Although the Second, 8 Third 9 and Fourth 10 Circuits have required an administrative plan or reasonable suspicion in the cases in which boardings of noncommercial vessels have been approved, most of these cases fail to differentiate document and safety inspections from other boardings, and none of the cases requiring cause or an administrative plan for safety and document inspections was decided with the benefit of the Supreme Court’s decision in Villamonte-Marquez.
B
Our decision that the boarding itself did not violate the Fourth Amendment does not extend to the search of the below-deck living quarters. Thus, we now turn to the question whether the below-deck inspection of the marine sanitation device, which led to the discovery of the contraband, was constitutionally permissible. We answer this question in two steps. Initially, we consider whether Lt. Rutz legitimately gained access to the below-deck cabin. Then, we inquire into the legitimacy of his continuation of the safety inspection after he went below deck.
First, we hold that Lt. Rutz’s entry into the below-deck cabin was lawful. Once Humphrey voluntarily told Lt. Rutz that there were firearms below deck, securing those weapons to insure the safety of the boarding party provided a legitimate reason to go below deck. The limited, protective “search” for and temporary “seizure” of the guns was justified by security considerations.
Cf. Terry v. Ohio,
Second, we conclude that Lt. Rutz’s below-deck continuation of the safety and document inspection by attempting to ex *749 amine the marine sanitation device, after he had legitimately gained access to the cabin, did not violate the Fourth Amendment. 11 Once Lt. Rutz was legitimately below deck, the defendants’ remaining expectation of privacy in the small cabin area was minimal. 12 The additional intrusion upon protected privacy interests generated by an inspection of the marine sanitation device was almost nil. 13 We conclude that the inspection of the marine sanitation device was reasonable under the circumstances. There was almost no invasion of protected Fourth Amendment privacy to weigh against the governmental interest in conducting a routine safety and document inspection.
Finally, we note the narrow basis of our holding that the warrantless and suspicion-less below-deck safety inspection did not violate the Fourth Amendment. Lt. Rutz had independent cause to go below deck in order to secure the weapons and insure the safety of the boarding party. Thus, we have not decided whether a routine safety and document inspection may intrude into the privacy of below-deck living quarters absent such cause. Indeed, the question whether a document and safety inspection may extend below deck without a warrant and probable cause has been explicitly reserved by the Supreme Court,
United States v. Villamonte-Marquez,
C
In the course of his inspection of the marine sanitation device, Lt. Rutz moved some sails and observed opaque aluminum foil packages, which later proved to contain marijuana. The last step of our Fourth Amendment inquiry requires us to evaluate the discovery and opening of the opaque aluminum foil packages. 15 The magistrate found that Lt. Rutz could see seeds and bits of green particles visible underneath the cellophane tape on one or *750 more of the packages that looked to him like marijuana, giving Lt. Rutz probable cause to seize the packages. We approve this determination.
The seeds and green particles were in “plain view.” The requirements for invoking the plain view doctrine were articulated in
United States v. Chesher,
Appellants argue that the third requirement for application of the plain view doctrine — that it be immediately apparent to the officer that evidence was present — is not satisfied. We conclude, however, that upon observing the packages, Lt. Rutz acquired a reasonable belief that it was contraband he was seizing. This conclusion is supported by the magistrate’s finding that Lt. Rutz saw seeds and green particles on the outside of the packages and inferred that the packages contained contraband.
Humphrey now argues that the presence of seeds and green herbal material is consistent with his statement to Lt. Rutz that the packages contained dried fruit, and therefore that it was not immediately apparent to Lt. Rutz that the packages constituted evidence. But “under the plain view doctrine ... the incriminating nature of an object is generally deemed ‘immediately apparent’ where police have probable cause to believe it is evidence of crime.”
Chesher,
We need not address the question whether a warrant would be required under some circumstances to open and search the aluminum foil packages. In this case, the remote area in which the vessel was found and the impossibility of obtaining a search warrant within a practical period of time created an exigent circumstance eliminating the necessity for a warrant.
See Watson,
In sum, neither the boarding of the Orea, nor the inspection of the marine sanitation device, nor the opening of the foil packages violated the Fourth Amendment. We thus reject appellants’ arguments that the marijuana evidence should have been suppressed.
Ill
Finally, we address appellants’ contention that there was insufficient evidence to support their convictions. All three defendants were convicted of conspiracy in violation of 21 U.S.C. § 955c and possession of marijuana on the high seas in violation of 21 U.S.C. § 955a(a). We consider the evidence in the light most favorable to the government.
See Glasser v. United States,
A
The primary evidence against Garbez and Smith is the undisputed fact that they were crew members of the
Orea,
a single cabin vessel ladened with 642 packages of marijuana that weighed 3,100 pounds. This is not a case where the con
*751
traband was located in a closed hold where even a large bulk of contraband would not necessarily be known to members of the crew.
See United States v. Willis,
Moreover, Humphrey made numerous statements incriminating Garbez and Smith. There was testimony that he stated, “We’ve thrown our charts away and you’ll never know where we’ve been,” and “We thought about sinking the Orea, but there was a chance the Coast Guard wouldn’t spot us in the water ...” Viewed in the light most favorable to the government, such statements support an inference of a concerted plan of action including all three defendants. In addition, Garbez made incriminating statements that he needed the $20,000 he was paid for the voyage and that he did not know the identity of the persons with whom Humphrey dealt. A photograph found on the Orea showed Garbez on top of a bunk laden with packages containing marijuana. Smith made no incriminating statements, but given all of the evidence, the magistrate’s conclusion that he possessed and conspired to possess the marijuana is supported by sufficient evidence.
B
Humphrey does not challenge the sufficiency of the evidence to support his possession conviction; he only challenges the sufficiency of the evidence to support his conspiracy conviction on the theory that if the evidence does not support the convictions of Smith and Garbez, he cannot be convicted of conspiring with himself. We have already rejected the contention that there was insufficient evidence to support the convictions of Smith and Garbez; therefore, we must reject this derivative claim by Humphrey. Not only was Humphrey the captain of a vessel containing a large quantity of contraband, but he also made a number of incriminating admissions.
We conclude that more than sufficient evidence supports the substantive and conspiracy convictions of all three defendants.
AFFIRMED.
Notes
. At the time, the Orea’s position was about 2000 miles from the Continental United States and over 700 miles from the closest landfall in the Aleutian Islands. Although designed for personal, not commercial, use, the Orea, like many pleasure craft, was capable of making transoceanic voyages.
. The role of the balancing test in Fourth Amendment jurisprudence is a much mooted subject — one that has generated considerable controversy among courts and commentators and some inconsistencies in the reasoning of the opinions of the Supreme Court.
See Texas v. Brown,
.
Villamonte-Marquez
does not directly control the outcome in this case, because its holding was limited to approval of a suspicionless boarding of a vessel in a ship canal connecting a customs port of entry with the high seas. The governmental interest in enforcing the customs laws — the interest that was decisive in
Villamonte-Marquez
— does not support a search on the high seas, where nothing like the functional equivalent of the border is involved.
Cf. Almeida-Sanchez v. United States,
. Indeed, the Magistrate found that the safety hazard presented by the location and course of the Orea constituted "cause” for the boarding. "Cause" for a safety and document inspection would normally be established by factors providing reason to believe a violation of safety or document regulations existed. We do not address the question whether hazard created by location could constitute cause in this case, because of our conclusion that the balance of interests reconciled the boarding with the *748 Fourth Amendment, even in the absence of probable cause.
.
See United States
v.
Burke,
.
See United States v. DeWeese,
.
See United States v. Luis-Gonzalez,
.
United States v. Streifel,
.
United States v. Demanett,
. In
United States v. Harper,
. The appellants’ brief relied almost exclusively on the claim that the initial boarding of the Orea violated the Fourth Amendment because of the absence of an administrative plan. After appellants’ opening brief was filed, the Supreme Court handed down its decision in VillamonteMarquez, undermining this contention. At oral argument, the appellants pressed the contention that the intrusion into the below-deck area violated the Constitution.
.
Katz v. United States,
. We note that the search did not extend to private lockers or other private areas not within the cabin in which Lt. Rutz was legitimately present.
. In
Watson,
we held that a warrant was not required for an on-deck safety and document inspection, but we did not consider the applicability of the Warrant Clause to a below deck search.
. The question whether the requirements of the "plain view” doctrine have been met is a mixed question of law and fact that we review de novo.
See United States v. Rahb,
