On February 25, 2008, at around 2 p.m., Barry Gardner, an Atlanta police officer, was parked in his patrol car in a convenience store parking lot. Several Texaco gas pumps were located in front of the store. At that time, Gardner observed Michael Morgan park near a gas pump, exit his vehicle, and walk towards the store. As he observed Morgan, Gardner noticed a bulge in Morgan’s waistband. Suspecting that a handgun caused the bulge, Gardner exited his patrol car and approached Morgan. Gardner had a hand on his handgun, but kept it holstered. Gardner reached Morgan before Morgan got to the store, requested permission to speak to him, and then asked him what the bulge was. Morgan responded: “What bulge,” and looked around nervously. At this point, Gardner realized that the bulge concealed a handgun, frisked Morgan, and placed him under arrest.1
A Northern District of Georgia grand jury indicted Morgan, who had been convicted of a felony on several previous occasions, for being a felon in possession of a firearm, in violation of 18 U.S.C. §§ 922(g)(1) and 924(e). He moved the district court to suppress the handgun Gardner had seized and the statements he made at the time of the seizure, contending that Gardner lacked reasonable suspicion to stop and frisk him. The court referred the motion to a magistrate judge, who held an evidentiary hearing, found that Gardner had reasonable suspicion for the stop and frisk, and recommended that the district court deny the motion. The district court did so. In its dispositive order, the court held that
*800the encounter between [Morgan] and Officer Gardner did not ripen into a Terry 2 stop until Officer Gardner had positively-identified the bulge under [Morgan’s] clothing as a gun.... The fact that Officer Gardner approached [Morgan] with his hand on his still-holstered gun — because of his legitimate concern that [Morgan] might be armed — did not convert this initial, consensual encounter into a detention.
Following this ruling, the parties agreed to a bench trial based on a joint stipulation of facts, in which Morgan admitted that he possessed the firearm found on February 25, 2008, that it was manufactured outside the State of Georgia and had crossed state lines, and that he had several prior felony convictions. At the conclusion of the trial, the court found Morgan guilty as charged. Following the imposition of sentence, a prison term of 179 months, Morgan took this appeal.
In his brief, Morgan argues that (1) the prosecution violated his right against double jeopardy; (2) the district court erred by denying his motion to suppress; and (3) the Government failed to establish a sufficient nexus between his firearm offense and interstate commerce, as the Constitution required as a condition precedent to his conviction. We consider these arguments in turn.
(1) “The Double Jeopardy Clause protects individuals against ... a second prosecution for the same offense after conviction.” United States v. Mayes, 158 F.3d 1215, 1219 (11th Cir.1998) (quotation omitted); see U.S. Const, amend. V (providing that no “person [shall] be subject for the same offence to be twice put in jeopardy of life or limb”). Morgan argues that the instant prosecution violated his right against double jeopardy because he was previously convicted in Fulton County, Georgia of the same felon-in-possession offense. The argument fails, however, because, as he properly concedes, the Supreme Court has rejected it. Abbate v. United States, 359 U.S. 187, 189-96, 79 S.Ct. 666, 668-71, 3 L.Ed.2d 729 (1959) (holding that a defendant’s prior conviction in state court did not bar a subsequent federal prosecution for the same conduct).
(2) The Fourth Amendment provides that “[t]he right of the people to be secure in their persons ... against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause.” U.S. Const, amend. IV. As an exception to the Amendment’s warrant requirement, a police officer may conduct a brief investigative stop if he has reasonable, articulable suspicion that criminal activity is afoot. Terry, 392 U.S. at 30, 88 S.Ct. at 1884-85. Significantly, however, “police-citizen exchanges involving no coercion or detention ... do[ ] not implicate Fourth Amendment scrutiny....” United States v. Perez, 443 F.3d 772, 777 (11th Cir.2006) (quotation and alterations omitted). In this respect, “[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 and putting questions to them if they are willing to listen.” United States v. Drayton, 536 U.S. 194, 200, 122 S.Ct. 2105, 2110, 153 L.Ed.2d 242 (2002).
Morgan contends that Officer Gardner’s initial approach and encounter constituted a seizure that was not supported by reasonable suspicion.3 However, the record reveals that, prior to frisking Morgan, Gardner did nothing more than approach Morgan in the parking lot, *801request permission to speak with him, and ask him about the bulge in his waistband. While Gardner had his hand on his still-holstered firearm during the approach, this fact alone did not transform the encounter into a seizure. Accordingly, reasonable suspicion was not required to support the stop.
(3) In United States v. McAllister, 77 F.3d 387, 390 (11th Cir.1996), we held that, because the government demonstrated that the defendant’s firearm had previously traveled in interstate commerce, § 922(g)(1) was not unconstitutional as applied to him. Morgan stipulated that the firearm at issue was manufactured outside the state of Georgia and therefore crossed state lines prior to his possession. This established the constitutionally required nexus to interstate commerce.
AFFIRMED.