This appeal arises out of two separate events involving Eugene I. Williams, twice arrested by the Virgin Islands Police Department on the island of St. Croix for offenses involving firearms and drugs. In the first event, several police officers approached a parked van with the rear doors open and found Williams inside bagging marijuana. The officers, upon seeing a leafy green substance, proceeded to stop, search, and arrest Williams. The District Court granted Williams’ motion to suppress evidence seized in connection with this arrest on the grounds that the police lacked reasonable suspicion to approach the van. In the second incident, Williams, who was standing on a street with a group of people, fled when he saw a police cruiser approach. During the ensuing chase, Williams threw away a loaded firearm and was later found hiding in the bathroom of a stranger’s house with marijuana in a nearby bathtub. The District Court denied Williams’ motion to suppress with regards to the second arrest, finding that his flight created reasonable suspicion for the police to pursue and that, in any event, Williams lost any expectation of privacy in the firearm and marijuana once he discarded them.
The United States filed an interlocutory appeal with regards to the suppression order relating to the first arrest, while Williams filed an interlocutory cross-appeal with regards to the denial of his mo *349 tion relating to the second arrest. Because we find that the police did not need reasonable suspicion to approach' the parked van in which Williams was bagging marijuana, we will reverse the District Court’s suppression order. However, with regards to Williams’ cross-appeal, we conclude that we lack jurisdiction over his interlocutory appeal and accordingly -will dismiss it.
I.
On May 27, 2004, a Grand Jury sitting in the District of the Virgin Islands, Division of St. Croix, returned a five-count superseding indictment charging Williams with the knowing possession of a firearm with an obliterated serial number in violation of 18 U.S.C. § 922(k); unauthorized possession of a firearm in violation of V.I.Code Ann. Tit. 14, § 2253(a) (2004); possession of marijuana with the intent to distribute in violation of 21 U.S.C. § 841(a)(1); using and-carrying a firearm during and in relation to a drug trafficking offense in .violation of 18 U.S.C. § 924(c)(1)(A); and unauthorized possession of a firearm with an obliterated serial number in violation of V.I.Code Ann. Tit. 23, § 481. The indictment stemmed from two separate arrests of Williams for criminal conduct, the first occurring on August 27, 2003 (the “First Arrest”), and the second on January 29, 2004 (the “Second Arrest”). 1
A. First Arrest
On the afternoon of August 27, 2003, Officer Uston Cornelius of the Virgin Islands Police Department and three other officers were on routine patrol in a marked police cruiser in an area of St. Croix known as the Castle Coakley residential area. They came upon a parked blue van, with its rears doors open, such that the officers could see straight into the vehicle. As the officers approached the van, they observed an individual (later identified as Defendant Williams) seated in the rear of the van engaged in some sort of activity. The -officers stopped their car, exited, and approached the van. Officer Cornelius later testified that he had no suspicion that criminal activity was taking place when he began his approach toward the van.
From a distance of about twelve or thirteen feet, Officer Cornelius saw Williams holding a large ziplock bag containing a green leafy substance that appeared to be marijuana and several smaller ziplock bags in his lap containing the same green leafy substance. When Williams noticed the officers approaching, he attempted to discard all thé bags in his lap and hands. Williams' was removed -from the van, searched and handcuffed. A search of the van revealed the larger bag and fourteen smaller bags. The green leafy substance field-tested positive for marijuana. After receiving Miranda warnings at the station house, Williams acknowledged responsibility for four of the bags in the van but denied ownership of the remaining bags.
B. Second Arrest
During the evening of January 29, 2004, Officer Franchet Hodge and his partners were on patrol in the Estate Profit area of St. Croix, a high crime area, in a marked police car. As Officer Hodge approached a group of individuals standing on a street corner, an individual later identified as Williams left the group and started off running down the street. Upon seeing Williams run, Officer Hodge exited his ve- *350 hide and gave chase. During the pursuit, Officer Hodge ordered Williams to stop, but Williams refused. Officer Hodge also saw Williams pause and take an unidentifiable object from his right side and throw it over a fence.
Williams then continued running and entered into a nearby house. Officer Hodge’s two partners, still in the car, pursued Williams to the house where they received permission from the owner of the house to search the premises. The officers found Williams hiding in the bathroom. The owner of the house indicated that he did not know Williams and had not given him permission to enter his residence. Williams was ordered out of the bathroom. The officers then conducted a pat down search and discovered that Williams was wearing a bulletproof vest. The officers also found eight bags of marijuana in the bathtub of the bathroom where Williams had been hiding. Officer Hodge went back to the vicinity where he had seen Williams throw the unidentified object and discovered a chrome handgun with six live rounds of ammunition in the magazine and one in the chamber. Williams was arrested.
C. Suppression Order
Following his arrest, Williams moved to suppress all physical evidence obtained and any statements made in connection with both arrests on the grounds that the evidence was seized through illegal war-rantless searches and seizures. A hearing was held before the District Court on June 3, 2004, in which Officers Cornelius and Hodges testified regarding the two arrests described above. The District Court issued its order in a Memorandum Opinion dated June 7, 2004, in which the court granted in part, and denied in part, the motion to suppress.
With regards to the Second Arrest, the District Court denied the suppression motion on the grounds that Officer Hodge had reasonable suspicion to pursue Williams because Williams had fled in a high crime area upon the sight of police. The District Court also found that Williams was not seized for purposes of the Fourth Amendment because he had fled and never submitted to police authority. Moreover, the firearm and ammunition which were found near the fence, and the marijuana found in the bathtub, were all abandoned by Williams, and thus he no longer had an expectation of privacy in these items.
However, the District Court granted the suppression motion with respect to the First Arrest. In particular, the District Court concluded that because the police lacked reasonable suspicion that criminal activity was afoot when they saw the parked van, they had no justification to approach the van, and consequently their approach did not constitute a lawful stop under
Adams v. Williams,
The United States now appeals from the District Court’s suppression order relating to the First Arrest. Williams has filed a cross-appeal from the District Court’s denial of his motion to suppress in connection with the Second Arrest. 2
*351 II.
We review de novo the District Court’s determination of reasonable suspicion and probable cause, as well as its determination regarding whether Williams was seized for purposes of the Fourth Amendment.
See Ornelas v. United States,
A First Arrest
The Fourth Amendment to the U.S. Constitution protects individuals from “unreasonable searches and seizures.” U.S. Const. amend IV. Generally, subject only to a few well-defined exceptions, warrant-less searches and seizures are
per se
unreasonable under the Fourth Amendment.
See United States v. Ross,
Thus, the central issue on appeal relating to the First Arrest is whether Williams was seized within the meaning of the Fourth Amendment when the police, who admitted they had no suspicion that the individual in the parked van was engaged in any unlawful activity, approached the van. If Williams was “seized” by the police when they approached the parked van without probable cause or reasonable suspicion to do so, then the District Court correctly suppressed all evidence obtained in connection with the ensuing arrest under the “fruits of the poisonous tree” doctrine.
See Wong Sun v. United States,
*352
We begin by defining the term “seizure” when used in the context of the Fourth Amendment. In the seminal
Terry
case, the Supreme Court explained that a seizure occurs “when the officer, by means of physical force or show of authority, has in some way restrained the liberty of a citizen.”
The District Court clearly erred when it held that the police lacked reasonable suspicion to approach the van. Before even addressing whether the police had reasonable suspicion to approach the van, the District Court should have inquired into whether Williams had been “seized” by the police. We conclude that there was no seizure because there was no use of physical force, nor was there any show of authority when the police approached the van in their marked cruiser, exited their vehicle, and approached the parked van on foot. As the Supreme Court has noted, “[l]aw enforcement officers do not violate the Fourth Amendment’s prohibition of unreasonable seizures merely by approaching individuals on the street or in other public places.”
United States v. Drayton,
Thereafter, as the police approached the van on foot, they noticed in plain and open view from a distance of twelve or thirteen feet such activities that created at least a reasonable suspicion that criminal activity was taking place. In particular, Officer Cornelius saw Williams holding a large ziplock bag with a green leafy substance appearing to be marijuana, as well as several smaller ziplock bags in his lap.
5
When Williams noticed the offi
*353
cers approaching, he attempted to discard all the bags in his lap and hands. At this point, the fact of Williams discarding the bags containing a green leafy substance appearing to be marijuana was sufficient to transform reasonable suspicion into probable cause, and the officers thus had justification to conduct a search of the van and arrest Williams.
See United States v. Burton,
Williams makes several attempts to salvage the District Court’s suppression order, all without merit. First, he argues that the police did in fact engage in a “show of authority” when they approached the van because they were wearing “quasi-military police uniform[s].” This argument is unconvincing. As the Supreme Court has noted, whether an officer is wearing a uniform has “little weight in the analysis” because “[ojfficers are often required to wear uniforms and in many circumstances this is cause for assurance, not discomfort.”
Drayton,
Second, Williams argues that the police’s approach constituted a seizure because he had a heightened expectation of privacy in the van. This argument is without merit. The fact that Williams was seated within the van, rather than standing on the street, is irrelevant in this matter. It is well-established that police officers who lack reasonable suspicion may approach and question people seated in vehicles in public places.
See, e.g., Johnson,
B. Second Arrest
Williams cross-appeals from the District Court’s denial of his motion to suppress with respect to his arrest of January 29, 2004. However, as the United States argues, we lack jurisdiction to hear Williams’ interlocutory cross-appeal.
It is well-settled that a criminal defendant may not file an immediate appeal of an order denying a pretrial motion to suppress evidence.
See Di Bella v. United States,
Despite the clear import of the case law, Williams nonetheless seeks to get around the bar on interlocutory appeal by relying on the collateral order doctrine, an argument which we must reject.
9
The Supreme Court, on numerous occasions, has emphasized the narrowness of the collateral order doctrine in the criminal context.
See Cobbledick v. United States,
In light of the foregoing concerns, courts have consistently ruled that a pretrial ruling on a suppression motion is not a collateral order under 28 U.S.C. § 1291 because the motion “presents an issue that is involved in and will be part of a criminal prosecution in process at the time the order is issued.”
See DiBella v. United States,
Finally, Williams relies on the following state court decisions for the proposition that we have “inherent jurisdiction” over the cross-appeal:
Commonwealth v. Barnes,
III.
For the foregoing reasons, we will reverse the order of the District Court in matter No. 04-2807 suppressing evidence seized in connection with the August 27, 2003 arrest and remand for further proceedings. With regards to the District Court’s order relating to the January 29, 2004 arrest in matter No. 04-2903, we will dismiss the cross-appeal for want of jurisdiction.
Notes
. The following description of the First and Second Arrests is taken from testimony provided at a hearing before the District Court on June 3, 2004, as well as from the facts found by the District Court and set forth in its suppression order.
. This Court has jurisdiction over a district court’s grant of a motion to suppress evidence pursuant to 18 U.S.C. § 3731 (permitting the United States to bring an interlocutory appeal). As discussed below, this Court, however, lacks jurisdiction to hear an interlocutory appeal of an order denying a motion to suppress evidence.
See United States v. Johnson,
.
Terry
also, permits an officer to conduct a frisk for weapons if the officer believes that the suspect may be armed.
. We frame our analysis in this manner to address the basis of the District Court's ruling that the police’s "approach[] of the van [did] not constitute a legitimate stop.” In so ruling, the District Court cited to the Supreme Court’s decision in
Adams v. Williams,
. At oral argument, counsel for Defendant argued that Officer Cornelius had no reason to conclude that the green leafy substance being bagged in the rear of the van was marijuana, and that it could have been oregano, basil, or even spinach. Whether oregano, basil, or spinach are the types of products that are routinely bagged in the rear of a van on the Virgin Islands is a determination we are not required to make. Under
Terry v. Ohio
and its progeny. Officer Cornelius could
*353
rely on his skill and experience in concluding that the green, leafy substance was marijuana, and in our view this was sufficient to support reasonable suspicion.
See United States v. Robertson,
. We note that the officers did not state that they believed they had probable cause as they approached the van. However, this does not preclude our finding that probable cause nonetheless existed as a matter of law. An analysis of Fourth Amendment issues involves "an objective assessment of the officer's actions in light of the facts and circumstances confronting him at the time and not on the officer’s actual state of mind at the time the challenged action was taken.”
United States v. Johnson,
. Williams argues that suppression was appropriate because there was no evidence that the marijuana belonged to him. This argument need not be addressed by this Court because it is not relevant to determining whether the police conducted an unlawful seizure, although it may be raised in a relevancy motion to the District Court or before a jury should the matter go to trial.
. The relevant portion of 18 U.S.C. § 3731 states:
An appeal by the United States shall lie to a court of appeals from a decision or order of a district court suppressing or excluding evidence or requiring the return of seized property in a criminal proceeding, not made after the defendant has been put in jeopardy and before the verdict or finding on an indictment or information, if the United States attorney certifies to the district court that the appeal is not taken for purpose of delay and that the evidence is a substantial proof of a fact material in the proceeding.
. Under the collateral order doctrine, "a district court order entered prior to final judgment is immediately appealable if it (1) conclusively determines the disputed question, (2) resolves an important issue completely separate from the merits of the case, and (3) is effectively unreviewable on appeal from a final judgment.”
United States v. McDade,
. The Supreme Court’s views have been influenced by the fact that "[p]romptness in bringing a criminal case to trial has become increasingly important as crime has increased, court dockets have swelled, and detention facilities have become overcrowded.”
Flanagan v. United States,
