OPINION OF THE COURT
James Edward Whitted appeals his conviction by jury for possession with intent to distribute a controlled substance in violation of 21 U.S.C. §§ 841(a)(1) and (b)(1)(A) and importation of a controlled substance into the United States in violation of 21 U.S.C. §§ 952(a) and 960(b)(1)(A). He claims that the District Court’s failure to suppress evidence found by customs officers during a border search of his cruise ship cabin was error and merits reversal of his conviction.
In order to resolve this appeal, we must answer a question of first impression: whether the Fourth Amendment requires any level of suspicion to justify a border search of a passenger cabin aboard a cruise liner arriving in the United States from a foreign port. For the reasons that follow, we believe that it does and that reasonable suspicion is the appropriate standard. In the present case, we conclude the reasonable suspicion standard is satisfied and, accordingly, will affirm Whit-ted’s conviction.
I. Facts and Procedural History
On the morning of September 25, 2004, the Adventure of the Seas cruise ship, *483which can carry up to 3,838 passengers and 1,185 crew, arrived from the foreign port of St. Maarten and docked in St. Thomas, United States Virgin Islands. Prior to the ship’s arrival, United States Customs and Border Protection officers gathered to prepare to board the ship and conduct enforcement actions. Canine Enforcement Officer Ralph Dasant was on duty that morning, and, after retrieving his drug-sniffing dog from its kennel, he used the Treasury Enforcement Communications System (“TECS”), a computerized database, to access the list of vessels arriving from a foreign port. He then used the database to access the manifest of crew and passengers aboard the Adventure of the Seas. Based on TECS information generated through this search, he selected approximately ten of the ship’s staterooms (out of a total of 1,557) to be looked at upon boarding the ship.
As is relevant here, TECS showed a “one-day lookout” for James Edward Whitted. App. 45. Dasant explained that a “lookout” was “a message that comes down in reference to either a crew member or a passenger on board a vessel, where we may have to take a look at that individual, being that it could be for drugs, it could be for a warrant or something of that nature.” App. 45-46. Based on the one-day lookout, Dasant conducted further inquiries in TECS and discovered that Whitted’s ticket had been purchased at the last minute. The system also indicated that Whitted had traveled to other drug source countries in the Caribbean and South America, including Colombia, Venezuela, and St. Maarten, and had a criminal record. Based on this information from the TECS database, Whitted’s cabin was chosen for inspection.
A team of customs officers, including Dasant and the drug-sniffing dog, boarded the ship and proceeded directly to the chief of security of the ship. Together, they went to the deck of the ship where Whitted’s cabin was located. After the officers knocked on the door to the cabin and ascertained that Whitted was not there, the chief of security unlocked the door and the officers began to prepare the room for canine screening.1 The dog did not alert in the hallway or at the door to the cabin. However, immediately after the cabin was prepped, the dog bolted into the room without being given a command and alerted to a bag. Dasant called him off and indicated the bag to the other officers. Customs officers Gail Fraser and Norman Ramirez then entered the room and searched through the bag, where they found “ladies’ shoes, men’s sandals, perfume bottles and a shaving cream container.” App. 91. After ascertaining from the chief of security that no woman was assigned to the room and noting that the shaving cream container seemed strange, they set aside those items found in the bag for further examination. The chief of security offered them the use of the ship’s x-ray machine. While x-raying the items, officers Fraser and Gloria Lambert noticed what appeared to be “pebbles” inside.
In the interim, Whitted returned to the cabin. Officer Ramirez took an oral declaration from Whitted, asking if he stayed in that cabin, whether the bags in the cabin belonged to him, and if any other passenger shared the cabin; Whitted acknowledged that it was his cabin and bag and that he was traveling alone. After Fraser *484and Lambert returned from the x-ray machine, the officers entered the cabin with Whitted. Special Agent Louis Penn, Jr. subsequently arrived, and he and the customs officers probed the “pebbles” and discovered a white, powdery substance, which field-tested positive for heroin. Whitted was arrested and later charged with possession with intent to distribute a controlled substance and importation of a controlled substance into the United States.
Before trial, Wdiitted moved to suppress the drugs seized from his cruise ship cabin. Dasant, Lambert, and Penn testified at the suppression hearing before the District Court. In addition to the facts recounted above, Penn testified that, following Whit-ted’s arrest, he had confirmed that Whit-ted had two prior convictions in North Carolina for heroin possession and sale. He also stated that he had verified the reason for the TECS lookout with San Juan officials and they had placed the lookout on TECS based on an outbound survey of Whitted in San Juan and his last-minute purchase of the ticket for cruise ship travel.
At the hearing, the parties made substantially the same arguments they do now. Whitted argued that he had a high expectation of privacy in the ship cabin, as his dwelling, such that the customs officers were required to have reasonable suspicion in order to search it. Here, he claimed, the facts available were insufficient to create reasonable suspicion that he was involved in criminal activity. The government contended that the search was a “routine” border search, focusing on the fact that it was performed regularly by customs officers rather than on its intrusiveness or the privacy interest at stake. In the alternative, it urged, the TECS information established reasonable suspicion.
On October 17, 2005, assuming, without deciding, that reasonable suspicion was required for the search of Whitted’s cabin, the District Court found the facts as a whole provided reasonable suspicion and, therefore, denied Whitted’s motion to suppress. The case then proceeded to trial and conviction on both counts. Whitted now appeals his conviction on the grounds that the District Court improperly denied his motion to suppress.
We have jurisdiction over Whitted’s appeal pursuant to 28 U.S.C. § 1291. We review the denial of a motion to suppress for clear error as to the factual findings and exercise plenary review over the application of law to those facts. United States v. Perez, 280 F.3d 318, 336 (3d Cir.2002).
II. Discussion
The Fourth Amendment protects “[t]he right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.” U.S. Const, amend. IV. Whether a search is reasonable will depend upon its nature and all of the circumstances surrounding it, United States v. Montoya de Hernandez, 473 U.S. 531, 537, 105 S.Ct. 3304, 87 L.Ed.2d 381 (1985), but, as a general matter, warrantless searches are unreasonable. See Cady v. Dombrowski, 413 U.S. 433, 439, 93 S.Ct. 2523, 37 L.Ed.2d 706 (1973).
Searches conducted at the nation’s borders, however, represent a well-established and long-standing exception to the warrant requirement. United States v. Ramsey, 431 U.S. 606, 619, 97 S.Ct. 1972, 52 L.Ed.2d 617 (1977); see also United States v. Flores-Montano, 541 U.S. 149, 152-53, 124 S.Ct. 1582, 158 L.Ed.2d 311 (2004). The exception applies not only at the physical boundaries of the United States, but also at the “the functional *485equivalent” of a border, Almeida-Sanchez v. United States, 413 U.S. 266, 272-73, 93 S.Ct. 2535, 37 L.Ed.2d 596 (1973), including the first port where a ship docks after arriving from a foreign country, United States v. Smith, 273 F.3d 629, 633 n. 8 (5th Cir.2001). The search here, conducted as the Adventure of the Seas arrived in St. Thomas from St. Maarten, was therefore a border search.
Provided that a border search is routine, it may be conducted, not just without a warrant, but without probable cause, reasonable suspicion, or any suspicion of wrongdoing. Montoya de Hernandez, 473 U.S. at 538, 105 S.Ct. 3304; see also United States v. Glasser, 750 F.2d 1197, 1201 (3d Cir.1985). This is because the expectation of privacy is “less at the border than in the interior” and “the Fourth Amendment balance between the interests of the Government and the privacy right of the individual is ... struck much more favorably to the Government.” United States v. Hyde, 37 F.3d 116, 119-20 (3d Cir.1994). Even at the border, however, an individual is entitled to be free from unreasonable search and seizure and his or her privacy interests must be balanced against the sovereign’s interests. Id. Consequently, certain searches, classified as “nonroutine,” require reasonable suspicion of wrongdoing to pass constitutional muster. Montoya de Hernandez, 473 U.S. at 541, 105 S.Ct. 3304. Border searches thus fall into two categories: “routine searches that require no suspicion and nonroutine searches that require reasonable suspicion.” Bradley v. United States, 299 F.3d 197, 204 n. 4 (3d Cir.2002).
The question here, therefore, is not whether the customs officers were required to have a warrant or probable cause in order to search Whitted’s private cabin, but, rather, whether reasonable suspicion was necessary. The parties agree that no suspicion is required in order for a customs officer to board and search the cruise ship as part of a routine border search. They disagree, however, as to whether any Fourth Amendment protection applies to a search of a private sleeping cabin aboard a cruise ship.
To answer this question, we must first decide whether the border search at issue was routine or non-routine and, so doing, set forth the correct standard required under the Fourth Amendment. ' We will then turn to a determination of whether this search was conducted in accordance with it.
A. Reasonable Suspicion and the Search of a Passenger Cabin of a Cruise Ship
To ascertain whether a border search can be classified as routine, we must examine the degree to which it intrudes on a traveler’s privacy. Bradley, 299 F.3d at 204. As the Supreme Court has held, “highly intrusive searches of the person” that implicate the “dignity and privacy interests of the person being searched” require reasonable suspicion. Flores-Montano, 541 U.S. at 152,124 S.Ct. 1582. Courts have focused on the privacy interest and the intrusiveness and indignity of the search to distinguish between routine and nonroutine searches. See United States v. Cardenas, 9 F.3d 1139, 1148 n. 3 (5th Cir.1993) (observing that “lower courts have generally classified routine searches as those which do not seriously invade a traveler’s privacy”); United States v. Vega-Barvo, 729 F.2d 1341, 1344-46 (11th Cir.1984) (evaluating intrusiveness and indignity of the search). Accordingly, patdowns, frisks, luggage searches, and automobile searches, involving neither a high expectation of privacy nor a seriously *486invasive search, are routine,2 whereas body cavity searches, strip searches, and x-ray examinations are considered nonroutine by virtue of their significant intrusion on an individual’s privacy.3
In the present case, Whitted argues that the search of a cruise ship cabin is not a routine border search because the Fourth Amendment’s primary purpose is the protection of privacy in one’s home and the search of one’s home, by its nature, is highly intrusive. He makes a compelling argument that an individual’s expectation of privacy in a cabin of a ship is no different from any other temporary place of abode. Because the search of his living quarters aboard the cruise ship intruded upon that most private of places — his home — he says it should be considered non-routine. In response to Whitted’s arguments, the government contends that the search of the cabin was a routine border search and “submits that the border search of ... Whitted’s cabin should be analyzed in the same way as that of a vehicle, as opposed to a person.” Appel-lee’s Br. 10 (citing United States v. Martinez-Fuerte, 428 U.S. 543, 561, 96 S.Ct. 3074, 49 L.Ed.2d 1116 (1976)).
Neither this Court nor the Supreme Court has addressed the issue of whether the search of a cabin of a cruise ship sufficiently intrudes upon an individual’s privacy to render it non-routine, so that reasonable suspicion of criminal activity is required. Indeed, there is a surprising dearth of authority on the matter.
The only authority which the government cites for the proposition that the search of a passenger’s cruise ship cabin amounts to a routine border search is readily distinguishable from the present case. See United States v. Brown, 298 F.Supp.2d 1317 (S.D.Fla.2004). In Brown, the “routine” aspect of the search was the use of “trained canines to detect narcotic odor from the hallways of newly-arrived cruise ships in Key West.” 298 F.Supp.2d at 1320. The search of Brown’s cabin occurred only after the drug-sniffing dog had alerted to the presence of drugs in the cabin while still in the hallway.4 While the court stated that the search was not distinguishable from a routine border search, clearly it was referring to the use of the dogs to “search” the ship’s hallways, not the search of the cabin once there was reasonable suspicion. Id. at 1320 & n. 2.
Existing caselaw counsels in favor of the approach urged by Whitted. In the case most clearly on point, the United States Court of Appeals for the Ninth Circuit concluded that “the search of private living quarters on a ship should require something more than naked suspicion.” United States v. Alfonso, 759 F.2d 728, 738 (9th Cir.1985). There, the customs officers had searched a cabin on a ship which had arrived from Colombia. The defendant argued that “even if the search [were] deemed a proper border search, the search *487of his private living quarters on the ship was unreasonable under the Fourth Amendment.” Id. at 733. Although the court found no cases that were directly on point,5 it reasoned that “[ojbviously, a search of the private living quarters of a ship is more intrusive than a search of other areas.... The private living quarters are at least analogous to a private dwelling.” Id. at 737-38. It then went on to conclude that the information known to the officers provided reasonable suspicion to justify the search. Id. at 738.
Other courts have reached similar conclusions. See State v. Logo, 798 So.2d 1182 (La.App. 4 Cir.2001) (holding that customs officers need reasonable suspicion to conduct a border search of the cabin of a passenger on a cruise ship). At least one United States district court has also required reasonable suspicion. United States v. Cunningham, No. 98-265, 1996 WL 665747 (E.D.La. Nov. 15, 1996). In that case, as ’here, a customs agent searched a passenger’s cabin without consent, a warrant, or probable cause. A drug dog alerted to the presence of drugs in the cabin and items in the room were subsequently found to contain drugs. The court stated that “with respect to searches of private areas of the vessel’s holds conducted for the purpose of discovering contraband, the Fourth Amendment requires reasonable suspicion, rather than probable cause as the appropriate standard by which to judge the search’s lawfulness.” Id. at *3 (citing Williams, 617 F.2d at 1087-88).
Those courts to consider searches at sea6 have also uniformly recognized a greater expectation of privacy in private dwelling areas of a ship than that in public areas.7 These cases routinely differentiate between those areas of a ship in which little or no privacy can be expected and an individual’s living and sleeping quarters.8 *488We similarly have suggested that a sleeper compartment in a train might give rise to a higher expectation of privacy than can be expected in more public or common areas of the train. United States v. Kim, 27 F.3d 947, 953 (3d Cir.1994).
We believe that these courts correctly recognize that the search of private living quarters aboard a ship at the functional equivalent of a border is a nonrou-tine border search and must be supported by reasonable suspicion of criminal conduct. The cruise ship cabin is both living quarters and located at the national border. As a result, one principle underlying the caselaw on border searches — namely, that “a port of entry is not a traveler’s home,” United States v. Thirty-Seven Photographs, 402 U.S. 363, 91 S.Ct. 1400, 28 L.Ed.2d 822 (1971) — runs headlong into the “overriding respect for the sanctity of the home that has been embedded in our traditions since the origins of the Republic,” foremost in our nation’s Fourth Amendment jurisprudence, Payton v. New York, 445 U.S. 573, 601, 100 S.Ct. 1371, 63 L.Ed.2d 639 (1980) (quoting United States v. Watson, 423 U.S. 411, 429, 96 S.Ct. 820, 46 L.Ed.2d 598 (1976) (Powell, J., concurring)). We find that requiring reasonable suspicion strikes the proper balance between the interests of the government and the privacy rights of the individual. It also best comports with the case law, which treats border searches permissively but gives special protection to an individual’s dwelling place, however temporary. We, therefore, join those courts that require reasonable suspicion to search of a passenger cabin aboard a ship.
As an initial matter, we have little trouble concluding that a passenger cabin is more like an individual’s home than an automobile. Whereas the “dignity and privacy interests of the person” do not carry over to border searches of an automobile, Flores-Montano, 541 U.S. at 152, 124 S.Ct. 1582, the privacy interests of an individual in his or her living quarters are significantly greater and compel more rigorous Fourth Amendment protection. The sanctity of private dwellings, whether temporary or permanent, ordinarily gives rise to “the most stringent Fourth Amendment protection.” United States v. Martinez-Fuerte, 428 U.S. 543, 561, 96 S.Ct. 3074, 49 L.Ed.2d 1116 (1976); see also Minnesota v. Carter, 525 U.S. 83, 89, 119 S.Ct. 469, 142 L.Ed.2d 373 (1998) (acknowledging that “in some circumstances a person may have a legitimate expectation of privacy in the house of someone else”); Minnesota v. Olson, 495 U.S. 91, 98-99, 110 S.Ct. 1684, 109 L.Ed.2d 85 (1990) (holding that overnight guests in the house of someone else have a reasonable expectation of privacy); Stoner v. California, 376 U.S. 483, 490, 84 S.Ct. 889, 11 L.Ed.2d 856 (1964) (hotel room); McDonald v. United States, 335 U.S. 451, 69 S.Ct. 191, 93 L.Ed. 153 (1948) (living quarters in rooming house). We believe that “one’s expectation of privacy in an automobile and of freedom in its operation are significantly different from the traditional expectation of privacy and freedom in one’s residence,” Martinez- *489 Fuerte, 428 U.S. at 561, 96 S.Ct. 3074, even where one’s residence is aboard a ship.
Individuals have a reasonable and high expectation of privacy in their living and sleeping quarters aboard ships, even at national borders, which merits Fourth Amendment protection. As a passenger of a cruise liner, Whitted had a reasonable expectation of privacy in his , cabin: he excluded others from it, used it as his home, and slept and conducted his daily life therein. This expectation was eminently reasonable from an objective standpoint. As the Supreme Court has recognized,
[w]e are at our most vulnerable when we are asleep because we cannot monitor our own safety or the security of our belongings. It is for this reason that, although we may spend all day in public places, when we cannot sleep in our own home we seek out another private place to sleep, whether it be a hotel room, or the home of a friend.
Olson, 495 U.S. at 98-99, 110 S.Ct. 1684. Just as individuals seek privacy in hotel rooms or another’s home to sleep, cruise ship passengers seek out privacy in their sleeping cabins and expect that they will not be opened or intruded upon without consent.
Mindful of the “centuries-old principle of respect for the privacy of the home,” we, therefore, consider a search of a individual’s living quarters among the most intrusive of searches — invading as it does a place where the individual expects not to be disturbed. Wilson v. Layne, 526 U.S. 603, 610, 119 S.Ct. 1692, 143 L.Ed.2d 818 (1999); see also Georgia v. Randolph, 547 U.S. 103, 115, 126 S.Ct. 1515, 164 L.Ed.2d 208 (2006); United States v. United States Dist. Court for Eastern Dist. of Mich., 407 U.S. 297, 313, 92 S.Ct. 2125, 32 L.Ed.2d 752 (1972) (“[P]hysical entry of the home is the chief evil against which the wording of the Fourth Amendment is directed.”). Here, the search was highly intrusive on the defendant’s privacy. Uninvited and in Whitted’s absence, the officers entered his de facto home, searched through his belongings, and subjected his private space to inspection by a drug-sniffing dog.
Because of the high expectation of privacy and level of intrusiveness, the search cannot be considered “routine” and must therefore be supported by reasonable suspicion of illegal activity. Reasonable suspicion is not a high standard that will prevent customs officers from detecting drug smugglers at our borders. Rather, it sets a relatively low threshold that will continue to permit the kind of cabin searches customs officers currently conduct.9
B. Reasonable Suspicion Existed to Search the Defendant’s Cabin
Under the reasonable suspicion standard, customs officers are required to have a “particularized and objective basis” to suspect illegal activity in order to conduct a search. United States v. Arvizu, 534 U.S. 266, 273, 122 S.Ct. 744, 151 L.Ed.2d 740 (2002). The officers must be able to articulate reasons that led to the search of the cabin that are indicative of behavior in which most innocent people do not engage. See Karnes v. Skrutski, 62 F.3d 485, 493 (3d Cir.1995). We consider the totality of the circumstances in determining whether reasonable suspicion existed at the time of the search. Arvizu, 534 U.S. at 274, 122 S.Ct. 744. Accordingly, although each individual factor alone may be consistent with innocent behavior, it is *490sufficient if together they “serve to eliminate a substantial portion of innocent travelers.” Karnes, 62 F.3d at 493.
In this case, numerous facts raised the suspicion that Whitted was involved in drug smuggling. The vast majority of these came from information in the TECS database. First, Whitted took a cruise that traveled to drug source countries. Second, Whitted had previously traveled to several known narcotics source countries. Third, Whitted purchased his ticket just prior to the ship’s date of departure and may have paid for it in cash.10 As other courts have recognized, most cruise passengers purchase tickets well in advance and with a credit instrument. See United States v. Smith, 273 F.3d 629, 634 (5th Cir.2001). Fourth, Whitted had a record of felony drug convictions. Last, TECS indicated that authorities in San Juan, Puerto Rico had found Whitted’s behavior suspicious and entered a lookout for him into the TECS database. This was significant because it could have indicated a warrant for his arrest or other criminal wrongdoing. It was also the impetus for querying the TECS database further and discovering other factors that raised a suspicion of drug smuggling.
The defendant argues that this information cannot establish reasonable suspicion because its source was the TECS computer database, unsubstantiated by other information. We reject this contention. As a general matter, customs officers should be able to rely on data provided by computer reports to create reasonable suspicion for a search. If they cannot, their hands would be tied until they either independently investigated the individual or contacted each source for the report to confirm its validity. Just as a customs officer is entitled to rely on unconfirmed information relayed to him by his supervisor in order to look out for and search an individual at the border, United States v. Love, 413 F.Supp. 1122 (S.D.Tex.1976), so too is a customs officer permitted to rely on TECS information entered by other customs officials to create reasonable suspicion for a search.11
Whitted also argues that the customs officers engaged in profiling, based on a “drug smuggling profile,” and cannot be said to have had reasonable suspicion. This last argument is entirely without merit. Whitted was selected for search not because of his resemblance to a smuggling profile, but because a one-day lookout specific to him had been entered into TECS. There was never any drug smuggling profile in evidence or relied on by the Court or the customs officers; the level of suspicion was based on the specific relevant facts known to the customs officers who searched Whitted’s cabin.12 As *491the Supreme Court has instructed, “ ‘the relevant inquiry is not whether particular conduct is ‘innocent’ or ‘guilty,’ but the degree of suspicion that attaches to particular types of noncriminal acts.’ ” Sokolow, 490 U.S. at 10, 109 S.Ct. 1581 (quoting Illinois v. Gates, 462 U.S. 213, 243-244, n. 13, 103 S.Ct. 2317, 76 L.Ed.2d 527 (1989)).
Viewed in their entirety, the facts here support the conclusion that the customs officers reasonably suspected Whitted of criminal activity. In the present case, customs officer Dasant found the information in TECS suspicious and chose to search Whitted’s cabin based upon it. By drawing on his particular expertise, he evaluated the information and drew inferences that created reasonable suspicion of drug smuggling. Arvizu, 534 U.S. at 273, 122 S.Ct. 744 (permitting officers “to make inferences from and deductions about the cumulative information available to them that ‘might well elude an untrained person’ ”); see also Brown v. Texas, 443 U.S. 47, 52 n. 2, 99 S.Ct. 2637, 61 L.Ed.2d 357 (1979) (observing that a trained investigator may be “able to perceive and articulate meaning in given conduct which would be wholly innocent to the untrained observer”). His training and three years experience as a canine enforcement officer doing similar work allowed him to draw inferences from “objective facts, meaningless to the untrained,” and substantiate his suspicions. United States v. Cortez, 449 U.S. 411, 419, 101 S.Ct. 690, 66 L.Ed.2d 621 (1981); see also Smith, 273 F.3d at 634-35 (finding reasonable suspicion on similar facts where passengers had taken a cruise bound for a drug source country and had traveled there before, had paid in cash two weeks before the cruise, had placed a call to a shoreside number, and one had a criminal record). Accordingly, we conclude that the agents had reasonable suspicion to search Whitted’s cabin and its contents, and did not run afoul of the Fourth Amendment in the context of a nonroutine search at the border.
Conclusion
For the foregoing reasons, we will AFFIRM the denial of the motion to suppress and uphold the jury’s verdict of conviction.