Defendant Eugene Nicholson, Jr., was indicted on one count of possession with intent to distribute approximately five kilograms of cocaine, and one count of possession with intent to distribute approximately ten kilograms of marijuana, both in violation of 21 U.S.C. § 841(a)(1). Defendant filed a motion to suppress evidence of the drugs, which narcotics officers located in his baggage during a drug interdiction at the Oklahoma City Union Bus Terminal. According to Defendant, the evidence which the officers uncovered arose from a warrantless search of his baggage in violation of the Fourth Amendment’s proscription against unreasonable searches. Following an evidentiary hearing, the district court denied Defendant’s motion. Defendant subsequently entered a conditional plea of-guilty pursuant to Fed.R.Crim.P. 11(a)(2), and the district court sentenced him to 115 months imprisonment. Defendant appeals the district court’s denial of his motion to suppress. We exercise jurisdiction under 28 U.S.C. § 1291, and reverse.
I..
The facts are undisputed. During the mid-morning of September 26, 1996, Detectives Mark Wenthold, Tina Arragon, Bo Leaсh, and Miguel Ramos, all of the Oklahoma City Police Department’s Drug Interdiction Unit, and all in street clothing, awaited the regularly-scheduled stop of a Greyhound bus en route from San Diego to New York City. The bus arrived at the Oklahoma City terminal around 9:30 a.m. After the passengers disembarked, Detectives Wenthold and Ramos, with the permission of Greyhound officials, began to inspect the luggage contained in the bus’ cargo hold. Meanwhile, Detectives Leach and Arragon began to inspect the bags in the overhead racks of the passenger compartment.
“[Ljooking over the luggage,” Detective Wenthold spotted a black, padlocked suitcase, which he described as a fabric-sided bag able to stand on its own. Detective Wenthold testified that he “initially” felt the sides of the bag with his palms perpendicular to the ground and flat, and detected “several large bundles” inside it. He then smelled the bag and sensed a strong odor of marijuana coming from its interior. When asked whether the black suitcase was the only bag he handled in this manner, Detective Went-hold responded, “probably not.” Detective Wenthold removed the bag from the cargo hold. The claim tag on the bag listed its destination as Toledo, Ohio. Detective Went-hold asked the bus driver to produce the *635 passengers’ tickets. A check of those tickets indicated that Defendant was the only passenger on the bus traveling to Toledo.
While Detective Wenthold and Ramos checked the bus’ cargo hold, Detectives Leach and Arragon entered the passenger area of the bus and began removing bags from the overhead racks. Detective Leach testified that “[djuring the course' of removing the bags from the overhead racks, ... they are manipulated and smelled____” Detective Leach further testified that he felt hard, “tightly-wrapped bundles” inside an unidentified black carry-on bag, which led him to believe the bag might contain illegal drugs. Although Detective Leach testified that he generally smelled carry-on bags after removing them from the overhead rack, he did not testify that he actually smelled Defendant’s carry-on bag, or that his suspicions were aroused by the bag’s scent. After manipulаting the carry-on bag, Detective Leach placed it back in the overhead rack.
Shortly thereafter, the detectives allowed the passengers to reboard the bus. Once the passengers were seated, Detectives Went-hold and Leach checked each of their tickets, and asked them to claim any carry-on baggage. Defendant sat directly beneath the black carry-on bag. Detective Leach identified Defendant, and specifically asked him if he had any carry-on bags in the overhead rack or luggage in the cargo hold. Defendant responded that he did not.
After Detectives Wenthold and Leach had checked the identity of each passenger, the black carry-on bag remained unclaimed. Detective Leach retrieved the bag from the overhead rack, held it above his head, and asked if anyone on the bus owned the bag. No one responded. Detective Wenthold next brought the black suitcase from the cargo hold onto the bus and made the same inquiry. Again, no one responded. The detectives then removed both bags from the bus to inspect their contents. Outside the bus, the detectives opened both bags. Inside the black carry-on bag, the detectives found'five gray duct-taped bundles each containing approximately one kilogram of cocaine. The bag also contained items of extra-large clothing which appeared to fit Defendant. Inside the black suitcase, the detectives found approximately ten kilograms of marijuana consisting of seven bricks, each tightly wrapped in cellophane.
Detective Wenthold asked Defendant to step off the bus. Upon questioning, Defendant repeatedly placed his hands in his coat pockets. When Detective Leach asked if he was carrying any weapons, Defendant responded no, and consented to a pat down' search of his person. In Defendant’s coat pocket, Detective Leach located several toiletry items and a torn claim check with a number that matched the number on the black suitcase’s claim tag. Detective Leach placed Defendant under arrest.
At the suppression hearing, Defendant stipulated to his ownership of the bags tó establish his standing to contest the detectives’ actions.
See Simmons v. United States,
II.
The Fourth Amendment protects the “right of the people to be secure in their ...
effects,
against unreasonable searches.” U.S. Const. amend. IV (emphasis added).
See United States v. Jacobsen,
[T]his Court uniformly has held that the application of the Fourth Amendment depends on whether the person invoking its protection can claim a “justifiable,” a “reasonable,” or a “legitimate expectation of privacy” that has been invaded by government action. This inquiry ... normally embraces two discrete questions. The first is whether the individual, by his conduct, has exhibited an actual (subjective) expectation of privacy,—whether ... the individual has shown that he seeks to preserve something as private. The second question is whether the individual’s subjective expectation of privacy is one that society is prepared to recognize as reasonable,—whether ... the individual’s expectation, viewed objectively, is justifiable under the circumstances.
(internal quotations, citations, and brackets omitted). When a defendant moves to suppress evidence obtained as a result of an allegedly unconstitutional search, he has the burden of demonstrating a subjective expectation of privacy that society is prepared to recognize as reasonable.
United States v. Conway,
Travelers have a legitimate expectation of privacy in their personаl luggage, which the Fourth Amendment protects.
See United States v. Chadwick,
Every search necessarily involves the use of sensory perception, i.e., touch, taste, smell, sight, or sound, but as case law teaches us, the use of sensory perception does not necessarily constitute a search. Logically then, as with sight and smell, not every manner of touch constitutes a search under the Fourth Amendment. Thus, in
United States v. Gault,
The D.C. Circuit employed an analysis similar to
Gault
in
United States v. Most,
[The officer’s] feeling of the bag went beyond the sort of highly limited contact that would be necessary if the bag were moved.... The bag had a drawstring and could easily be transported without physical manipulation of the bag itself____ Although Mоst might reasonably have expected that his bag would be moved, he had no reason to expect that it would be touched in the way that the police officer subsequently touched it.
Id. at 198 n. 13 (emphasis in original).
The circuits uniformly agree that an officer’s touching of a bag’s exterior does not necessarily constitute a search. In
United States v. Guzman,
Other circuits have been more cautious in their language, suggesting, as do
Gault
and
Most,
that the degree of intrusion is the determining factor in whether an officer’s contact with the exterior of luggage constitutes a search under the Fourth Amendment. In
United States v. Lovell,
In
United States v. McDonald,
In a vigorous dissent, Circuit Judge Ripple acknowledged that an officer’s “mere touch” of a bag in an overhead rack does not constitute a search, because passengers assume the risk that their bags might be subjected to the minimal sort of moving that occurs when other passengers seek to place their bags in the same rack.
Id.
at 1331-32 (Ripple, J., dissenting). The dissent emphasized, however, that intrusions into the privacy of another are a matter of degree.
Id.
at 1332 (citing
Minnesota v. Dickerson,
III.
With this background in mind, the question we must answer in this case is whether the detectives’ initial manner of handling Defendant’s checked suitcase and carry-on bag constituted a search under the Fourth Amendment. If the detectives’ actions constituted a search, then the search, absent a warrant, was necessarily unreasonable. The Supreme Court hаs repeatedly observed that warrantless searches are per se unreasonable under the Fourth Amendment, subject only to a few, well-established exceptions,
see Thompson v. Louisiana,
When the bus arrived at the terminal, the detectives did not have probable cause to believe that illegal drugs were on the bus. Nor did they have articulable suspicion to suspect the presence of illegal drugs. The detectives knew only that the wеst coast is a source area for illegal drugs. The detectives did not have the passengers’ permission to examine their luggage. 3 Bus officials did not *639 notify the passengers that their luggage was subject to inspection. What occurred here, plain, and simple, was a suspieionless police sweep of a bus in interstate travel.
A.
Detective Leach testified that he removed Defendant’s carry-on bag from the overhead rack and “manipulated” it. As a result, Detective Leach detected “tightly wrapped bundles” inside the bag, which he believed to be illegal drugs. He testified: “[T]here is a distinct feel to hard taped bundles inside of a soft-sided carry-on bag. It’s not something that you experience in a large number of people’s bags that are traveling.” Relying on the Seventh Circuit’s decision in
McDonald,
We believe the district court’s holding with resрect to the initial handling of Defendant’s carry-on bag sweeps too broadly. The degree of intrusion is the determining factor as to whether an officer’s contact with the exterior of luggage constitutes a search under the Fourth Amendment. To be sure, placing, a bag in an overhead rack of a commercial bus exposes it to certain intrusions. Seeking to make room for their own articles, other passengers may push and move the bag. Therefore, Defendant had no reasonable expectation that his carry-оn would not be touched in this manner. This does not mean, however, that’ Detective Leach was free to manipulate Defendant’s carry-on bag in any manner so long as he did not open the bag and reveal its contents to the eye. By manipulating Defendant’s bag in a manner that Defendant did not reasonably expect from other passengers, Detective Leach conducted a search within the meaning of the Fourth Amendment.
Compare Gault,
We therefore part with the Seventh Circuit’s conclusion in
McDonald
that a passenger on a commercial bus has no reasonable expectation that a carry-on bag in an overhead rack will not be “manipulated by others.”
We believe that by handling Defendant’s carry-on bag in this manner, Detective Leach departed from the type of handling a commercial bus passenger would reasonably expect his baggage to be subjected, and entered the domain protected by the Fourth Amendment. When Detective Leach removed Defendant’s carry-on bag from the overhead rack and conducted a “tactile examination ... aimed at discovering the nature of-the contents of the bag,”
McDonald,
B.
Next we address whether Detective Wenthold’s manner of handling Defendant’s
*640
cheeked suitcase in the cargo hold of the bus constituted a search. Detective Wenthold testified that he initially examined Defendant’s black suitcase in the cargo hold by feeling its sides with his hands perpendicular to the ground and flat. Apparently pressing on the sides of the standing suitcase, Detective Wenthold detected “several large bundles” inside it. Detective Wenthold then smelled the suitcase and sensed the odor of marijuana. Based on these facts, the district court concluded that Defendant had no reasonable expectation of privacy in the air surrounding his suitcase,
see Gault,
Detective Wenthold smelled the suitcase, however, only after he felt its exterior with the palms of his hands, detected the bundles, and became suspicious. This case is unlike the Fifth Circuit’s decisions in Lovell and Viera, where officers gently pressed on the sides of the bags in order to circulate the air in preparation for a sniff, human or dog. In those cases, unlike here, the officers’ initial handling of the bags revealed nothing of independent evidentiary value and thus was considered minimally intrusive. Like Detective Leach’s handling of the carry-on bag, Detective Wenthold was not simply prepping the suitcase so that he or a dog could sniff it. No dog was present at the scene. Rather, by pressing on the sides of the suitcase, Detective Wenthold acknowledged that he was inspecting the contents of the suitcase. Detective Wenthold testified on direct examination: “[I]t didn’t feel like there was any type of clothing or personal articles inside. It just felt like hard bundles.” On cross examination, he reiterated: “Instead of feeling like someone’s clothing or shoes, it felt like several large bundles packed inside there, really hard bundles.”
By cheeking his suitcase with the bus line, Defendant could reasonably expect that it would be lifted by the handle and moved, even tossed, on its way to and from the cargo hold. But we believe Detective Wenthold’s pressing on the sides of the suitcase with the palms of his hands in order to inspect its contents violated Defendant’s reasonable expectаtion of privacy in the suitcase because it went beyond that type of contact which a passenger may reasonably expect when checking a bag with a commercial bus line.
See United States v. Garcia,
IV.
Because we conclude that the detectives’ initial mаnner of handling Defendant’s luggage constituted an unreasonable search, the fruits of that .search must be suppressed. Despite the Government’s assertions to the contrary, we may not justify the detectives’ subsequent-opening of Defendant’s luggage on the basis that Defendant subsequently abandoned his luggage by failing to claim ownership. Abandonment must be voluntary. Because any abandonment was a direct consequence of the detectives’ Fourth Amendment violation in initially handling Defendant’s luggage without a warrant, we deem such abandonment involuntаry as a matter of law.
See United States v. Garzon,
This ease presents yet another variation on the line-drawing that has become commonplace when we address the contours of Fourth Amendment rights. As we noted nearly two decades ago in
United States v. Rengifo-Castro,
REVERSED and REMANDED.
Notes
. The court in
Guzman
relied largely on the Eighth Circuit's two-to-one decision in
United States
v.
Harvey,
. Judge Ripple aptly concluded his dissent with the statement: "No federal judge traveling by bus or rail would expect, or permit, a fellow passenger to rub, squeeze or manipulate his or her hand baggage in a concerted attempt to determine its contents. We should protect for others the privacy that we would demand for ourselves.”
McDonald,
. While the detectives obtained the permission of bus officials to board and inspect the bus, the Government does not contend that, and we do not address whether, those officials could validly consent to the detectives’ search of Defendant's luggage.
See Illinois v. Rodriguez,
. Nor may we justify the detectives’ actions, as the Government argues, based on the “plain touch" doctrine.
See Minnesota v. Dickerson,
