CYR, Circuit Judge.
Appellant Gerónimo Pizarro-Calderon (“Pizarro”) contends that the district court erred in refusing to suppress six block-like articles — packaged in opaque beige and brown tape — which ultimately led to his conviction for possessing cocaine with intent to distribute in violation of 21 U.S.C. § 841(a)(1) (1993). We reverse.
I
BACKGROUND
The district court adopted the findings recommended by the magistrate judge who conducted the suppression hearing. On January 8, 1993, Security Officer Gladys Martinez del Valle (“Martinez”) was screening passengers and monitoring their carry-on luggage for weapons and explosives at a security checkpoint in the Isla Verde Airport terminal.
See
14 C.F.R. § 107.20 (1995) (Federal Aeronautics Administration (“FAA”) regulation mandating screening requirements for carry-on luggage), § 107.21 (banning unauthorized possession of any “explosive, incendiary, or deadly or dangerous weapons” beyond airport checkpoints). Prominent signs forewarned passengers, in English and Spanish, that their persons and carry-on luggage were subject to screening and search for weapons and explosives. Security screeners normally use x-ray machines to scan all carry-on luggage; metal detectors and hand scanners to screen passengers.
While tending the x-ray monitor, Martinez noticed a carry-on bag containing an unidentifiable dark object. She had been trained to regard such dense, nonreflective objects as possible camouflage for weapons or explosives. Upon questioning by Martinez, appellant Pizarro stated that the carry-on bag belonged to him, and the nonreflective objects inside were gift boxes containing “figurines.” Concerned that the figurines reflected no distinguishable silhouette on the x-ray monitor, Martinez asked Pizarro to open the carry-on bag. When Pizarro “sort of hesitated,” United States Department of Agriculture Inspector José Mercado, working beside Martinez, directed Pizarro to open the carry-on bag, then summoned a local law enforcement officer, Juan Avilés, to the security checkpoint.
Pizarro opened the carry-on bag in the presence of Martinez, Officer Avilés, and Inspector Mercado, revealing a box wrapped in Christmas paper. The box contained a layer of sanitary napkins, a layer of dark blue paper and, finally, six blocks wrapped in opaque beige and brown tape. A nineteen-year veteran of the Puerto Rico Police, Officer Avilés immediately suspected that the concealed blocks contained cocaine. Whereupon he seized the carry-on bag and its contents, then arrested and handcuffed Pizarro.
After placing Pizarro in an airport police-station cell, Avilés contacted the United States Drug Enforcement Administration
(“DEA”). Shortly thereafter, DEA agents tested the blocks by piercing their opaque wrappings; the contents tested positive for cocaine. In due course, Pizarra was indicted for possessing six kilograms of cocaine with intent to distribute, in violation of 21 U.S.C. § 841(a)(1), (b)(1)(A).
Pizarra moved to suppress the test results and the cocaine, on the ground that the warrantless searches of the carry-on bag and the containers inside it (i.e., the Christmas box and the blocks enclosed in intact, opaque wrapping) violated the Fourth Amendment to the United States Constitution. The government successfully defended the challenged DEA testing as a mere continuation of the administrative search aimed at ensuring airline security.
See United States v. Pizarro-Calderon,
829 F.Supp. 511,
515
(D.P.R.1993). Following a jury trial, Pizarra was convicted and sentenced.
II
DISCUSSION
The government must demonstrate that the warrantless DEA testing of the enclosed blocks either entailed no Fourth Amendment search or came within some recognized exception to the warrant requirement.
See, e.g., United States v. Doward,
41 F.3d 789, 791 (1st Cir.1994).
The government contends that the carry-on bag initially was opened and searched at the airport security checkpoint pursuant to a lawful administrative search for weapons and explosives.
See, e.g., United States v. Skipwith,
482 F.2d 1272, 1277-78 (5th Cir.1973) (holding that inadvertent discovery of evidence of criminal activity in course of lawful security search for weapons at airport checkpoint does not violate Fourth Amendment). Further, it argues, once Pizarro’s carry-on bag and the Christmas gift box lawfully had been opened for security purposes, it was proper to seize and open the packaged blocks thereby exposed to Avilés’ “plain view.”
See Coolidge v. New Hampshire,
403 U.S. 443, 466, 91 S.Ct. 2022, 2038, 29 L.Ed.2d 564 (1971).
Pizarra protests on both counts. First, he says, carry-on luggage screenings must be confined to ferreting out threats to airline security (i.e., weapons and explosives used in air piracy), whereas the customary presence of Officer Avilés at the security checkpoint permitted an inference that security concerns were a mere subterfuge for intercepting contraband posing no threat to airline security. Second, even assuming probable cause to seize the suspicious blocks, a search warrant was required before the intact, opaque packaging enclosing the blocks could be pierced to test for cocaine.
A.
The Searches and Seizure at the Security
Checkpoint
Pizarra argues that the warrantless search of the carry-on bag violated his Fourth Amendment rights,
ab initio,
since the customary presence of Avilés at the checkpoint subverted an otherwise lawful airline security screening into a warrantless general search for contraband (viz., cocaine) unrelated to airline security. The district court found that—
the search was conducted by a security agent at the airport, and that the local police officer was summoned to the site of the search only
after
the initial X-ray scan did not rule out the presence of either weapons or explosives in defendant’s luggage, requiring the presence of additional security.
Pizarro-Calderon,
829 F.Supp. at 514 (emphasis added).
Routine security searches at airport checkpoints pass constitutional muster
because the compelling public interest in curbing air piracy generally outweighs their limited intrusiveness.
See, e.g., United States v. Pulido-Baquerizo,
800 F.2d 899, 902 (9th Cir.1986);
cf. United States v. Ferrer,
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CYR, Circuit Judge.
Appellant Gerónimo Pizarro-Calderon (“Pizarro”) contends that the district court erred in refusing to suppress six block-like articles — packaged in opaque beige and brown tape — which ultimately led to his conviction for possessing cocaine with intent to distribute in violation of 21 U.S.C. § 841(a)(1) (1993). We reverse.
I
BACKGROUND
The district court adopted the findings recommended by the magistrate judge who conducted the suppression hearing. On January 8, 1993, Security Officer Gladys Martinez del Valle (“Martinez”) was screening passengers and monitoring their carry-on luggage for weapons and explosives at a security checkpoint in the Isla Verde Airport terminal.
See
14 C.F.R. § 107.20 (1995) (Federal Aeronautics Administration (“FAA”) regulation mandating screening requirements for carry-on luggage), § 107.21 (banning unauthorized possession of any “explosive, incendiary, or deadly or dangerous weapons” beyond airport checkpoints). Prominent signs forewarned passengers, in English and Spanish, that their persons and carry-on luggage were subject to screening and search for weapons and explosives. Security screeners normally use x-ray machines to scan all carry-on luggage; metal detectors and hand scanners to screen passengers.
While tending the x-ray monitor, Martinez noticed a carry-on bag containing an unidentifiable dark object. She had been trained to regard such dense, nonreflective objects as possible camouflage for weapons or explosives. Upon questioning by Martinez, appellant Pizarro stated that the carry-on bag belonged to him, and the nonreflective objects inside were gift boxes containing “figurines.” Concerned that the figurines reflected no distinguishable silhouette on the x-ray monitor, Martinez asked Pizarro to open the carry-on bag. When Pizarro “sort of hesitated,” United States Department of Agriculture Inspector José Mercado, working beside Martinez, directed Pizarro to open the carry-on bag, then summoned a local law enforcement officer, Juan Avilés, to the security checkpoint.
Pizarro opened the carry-on bag in the presence of Martinez, Officer Avilés, and Inspector Mercado, revealing a box wrapped in Christmas paper. The box contained a layer of sanitary napkins, a layer of dark blue paper and, finally, six blocks wrapped in opaque beige and brown tape. A nineteen-year veteran of the Puerto Rico Police, Officer Avilés immediately suspected that the concealed blocks contained cocaine. Whereupon he seized the carry-on bag and its contents, then arrested and handcuffed Pizarro.
After placing Pizarro in an airport police-station cell, Avilés contacted the United States Drug Enforcement Administration
(“DEA”). Shortly thereafter, DEA agents tested the blocks by piercing their opaque wrappings; the contents tested positive for cocaine. In due course, Pizarra was indicted for possessing six kilograms of cocaine with intent to distribute, in violation of 21 U.S.C. § 841(a)(1), (b)(1)(A).
Pizarra moved to suppress the test results and the cocaine, on the ground that the warrantless searches of the carry-on bag and the containers inside it (i.e., the Christmas box and the blocks enclosed in intact, opaque wrapping) violated the Fourth Amendment to the United States Constitution. The government successfully defended the challenged DEA testing as a mere continuation of the administrative search aimed at ensuring airline security.
See United States v. Pizarro-Calderon,
829 F.Supp. 511,
515
(D.P.R.1993). Following a jury trial, Pizarra was convicted and sentenced.
II
DISCUSSION
The government must demonstrate that the warrantless DEA testing of the enclosed blocks either entailed no Fourth Amendment search or came within some recognized exception to the warrant requirement.
See, e.g., United States v. Doward,
41 F.3d 789, 791 (1st Cir.1994).
The government contends that the carry-on bag initially was opened and searched at the airport security checkpoint pursuant to a lawful administrative search for weapons and explosives.
See, e.g., United States v. Skipwith,
482 F.2d 1272, 1277-78 (5th Cir.1973) (holding that inadvertent discovery of evidence of criminal activity in course of lawful security search for weapons at airport checkpoint does not violate Fourth Amendment). Further, it argues, once Pizarro’s carry-on bag and the Christmas gift box lawfully had been opened for security purposes, it was proper to seize and open the packaged blocks thereby exposed to Avilés’ “plain view.”
See Coolidge v. New Hampshire,
403 U.S. 443, 466, 91 S.Ct. 2022, 2038, 29 L.Ed.2d 564 (1971).
Pizarra protests on both counts. First, he says, carry-on luggage screenings must be confined to ferreting out threats to airline security (i.e., weapons and explosives used in air piracy), whereas the customary presence of Officer Avilés at the security checkpoint permitted an inference that security concerns were a mere subterfuge for intercepting contraband posing no threat to airline security. Second, even assuming probable cause to seize the suspicious blocks, a search warrant was required before the intact, opaque packaging enclosing the blocks could be pierced to test for cocaine.
A.
The Searches and Seizure at the Security
Checkpoint
Pizarra argues that the warrantless search of the carry-on bag violated his Fourth Amendment rights,
ab initio,
since the customary presence of Avilés at the checkpoint subverted an otherwise lawful airline security screening into a warrantless general search for contraband (viz., cocaine) unrelated to airline security. The district court found that—
the search was conducted by a security agent at the airport, and that the local police officer was summoned to the site of the search only
after
the initial X-ray scan did not rule out the presence of either weapons or explosives in defendant’s luggage, requiring the presence of additional security.
Pizarro-Calderon,
829 F.Supp. at 514 (emphasis added).
Routine security searches at airport checkpoints pass constitutional muster
because the compelling public interest in curbing air piracy generally outweighs their limited intrusiveness.
See, e.g., United States v. Pulido-Baquerizo,
800 F.2d 899, 902 (9th Cir.1986);
cf. United States v. Ferrer,
999 F.2d 7, 9 (1st Cir.1993) (upholding warrantless search of checked luggage on alternate ground of “abandonment,” but faulting government’s “falling-domino approach, by which each intrusion diminishes privacy expectations enough to permit further infringements”). Consequently,
all
carry-on luggage can be subjected to initial x-ray screening for weapons and explosives without offending the Fourth Amendment. In the event the initial x-ray screening is inconclusive as to the presence of weapons or explosives, the luggage may be hand-searched as reasonably required to rule out their presence.
Pulido-Baquerizo,
800 F.2d at 902.
Other contraband inadvertently discovered during a routine checkpoint search for weapons and explosives may be seized and introduced in evidence at trial even though unrelated to airline security.
See, e.g., Skipwith,
482 F.2d at 1277-78. On the other hand, lawful airline security searches of carry-on luggage may not be enlarged or tailored systemically to detect contraband
(e.g.,
narcotics) unrelated to airline security.
See, e.g., United States v. $124,570 U.S. Currency,
873 F.2d 1240, 1243-45 (9th Cir.1989) (upholding suppression of contraband unrelated to airline security where sereeners were rewarded monetarily by law enforcement authorities for detecting such contraband in carry-on luggage).
As we conclude that the government failed to demonstrate that the
subsequent
warrant-less search of the packaged blocks by the DEA satisfied the Fourth Amendment warrant requirement,
see infra
Section II.B, for present purposes we simply assume
arguen-do
that the carry-on bag and the Christmas box were subjected to lawful airport administrative searches.
B.
The Subsequent DEA Searches of the Seized Blocks
The district court upheld the warrant-less penetration of the opaque packaging enclosing the seized blocks on the ground that the DEA tests were “not ... searches]
per se”
but merely “more thorough examination[s] of the objects which had already been lawfully seized.”
Pizarro-Calderon,
829 F.Supp. at 515. We cannot agree.
The uncontroverted evidence reveals that until the DEA agents conducted their field tests, the opaque packaging enclosing the six blocks remained intact, precluding any “plain view” of their contents such as might permit a warrantless search in the absence of exigent circumstances.
See, e.g., United States v. Miller,
769 F.2d 554, 558 (9th Cir.1985) (poking finger through plastic bag containing white powder, or cutting into opaque fiberglass container inside plastic bag, constitutes “search” requiring warrant, where both “containers were originally packed inside suit-ease”). Thus, regardless whether the packaged blocks could have been subjected to lawful warrantless search
at the security checkpoint,
the question with which we are presented is whether a warrant was required before the packaging enclosing the blocks could be pierced once the blocks had been seized and
removed from, the security checkpoint.
The government neither cites, nor have we found, any case upholding a war-rantless administrative search for contraband unrelated to airline security concerns, absent exigent circumstances, consent, a finding of “virtual certainty,” or some other recognized exception to the warrant requirement.
Although probable cause, as well as exigent circumstances, may support the war-rantless
seizure
of an enclosed opaque container,
see Texas v. Brown,
460 U.S. 730, 743, 103 S.Ct. 1536, 1544, 75 L.Ed.2d 502 (1983) (involving validity of warrantless
seizure
of tied-off balloon containing drugs), the
same
probable-cause showing is not necessarily sufficient to justify its subsequent warrant-less
search. Id.
at 749-51, 103 S.Ct. at 1547— 48 (Stevens, J., concurring);
United States v. Chadwick,
433 U.S. 1, 13-14 n. 8, 97 S.Ct. 2476, 2484-85 n. 8, 53 L.Ed.2d 538 (1977);
Miller,
769 F.2d at 558;
cf. United States v. Jacobsen,
466 U.S. 109, 114, 104 S.Ct. 1652, 1656, 80 L.Ed.2d 85 (1984) (upholding seizure to prevent loss or destruction of contraband, but noting that “Fourth Amendment requires that [the police] obtain a warrant before examining contents of such a package”).
These discrete treatments stem from the recognition that seizure temporarily deprives the defendant of a
possessory
interest only, whereas a search entails an intrusion upon
privacy
interests as well.
See generally Segura v. United States,
468 U.S. 796, 806, 104 S.Ct. 3380, 3386, 104 S.Ct. 3380 (1984). Normally, therefore, once an exigency ends, as by an arrest or the seizure and custodial retention of a container by the police, a
neutral judicial officer
must authorize any subsequent search on a showing of probable cause.
United States v. Soule,
908 F.2d 1032, 1040 (1st Cir.1990) (citing
Shadwick v. City of Tampa,
407 U.S. 345, 350, 92 S.Ct. 2119, 2122-23, 32 L.Ed.2d 783 (1972)).
Although the government was required to show that any warrantless search was valid under an exception to the warrant requirement,
see Doward,
41 F.3d at 791;
United States v. Rutkowski,
877 F.2d 139, 141 (1st Cir.1989), it has not attempted to demonstrate that the warrantless piercing of the packaged blocks was either an integral part of the security-checkpoint search or came within any other exception to the warrant requirement. The government instead simply concludes, as did the district court,
see Pizarro-Calderon,
829 F.Supp. at 515, and without argumentation or citation to authority, that the warrantless piercing of the packaged blocks at the police station was simply an extension of the hand-search initiated at the checkpoint.
But see supra
note 5. Moreover, the government does not pretend that the DEA agents pierced the packaged blocks for any purpose other than to test for illicit drugs.
Thus, although we may affirm the denial of a suppression motion on
any ground supported by the record,
see, e.g., Soule,
908 F.2d at 1036 n. 7, the legal theories relied on by the government have led to a dearth of record evidence — not to mention argumentation — to support such an exercise of discretion.
The litigation strategy adopted by the government seems especially remarkable considering the portentous district court opinion previously entered in the
companion
ease,
United States v. Figueroa-Cruz,
822 F.Supp. 853 (D.P.R.1993);
see supra
note 2, wherein the government elected not to appeal from an order suppressing virtually identical evidence seized from the person next in line to Pizarro at the security checkpoint.
In the companion case, the district court suppressed
the cocaine Figueroa was carrying — in
Christmas gift packages
inside his luggage— because Avilés had permitted the DEA to conduct the
initial
search at the airport police station without first obtaining a warrant. Avilés testified that he arrested Figueroa based on probable cause to believe that the gift boxes, exposed to view during the security-checkpoint search of his carry-on bag, were so similar to Pizarro’s gift box that it was likely that they too contained blocks of cocaine.
The government’s attempt to distinguish the two cases misses the mark. The carry-on bags, the gift boxes, and the blocks enclosed in opaque
packaging
— all were discrete closed containers. Even assuming the warrantless checkpoint searches conducted on the carry-on bags and the gift boxes were lawful, the government nevertheless failed to establish that the subsequent warrantless DEA penetration of the previously unopened blocks enclosed in opaque packaging came within any recognized exception to the warrant requirement. Consequently, their war-rantless search at the police station — after any exigency had ceased — violated the Fourth amendment.
Ill
CONCLUSION
As the government failed to shoulder its burden, by demonstrating either that its war-rantless searches of the opaque packaged blocks were permissible under the Fourth Amendment, or that the admission of the tainted evidence was harmless beyond a reasonable doubt,
see United States v. Modarressi,
886 F.2d 6, 8 (1st Cir.1989), appellant’s conviction must be reversed.
The district court judgment is reversed.