SUMMARY ORDER
Defendants-Appellants Dolphus Pryor (“Pryor”) and Marcel Bullock (“Bullock”) (collectively, the “defendants”) appeal from judgments of conviction entered on March 22, 2010, and June 2, 2010, respectively. Following a joint jury trial, both defendants were convicted of conspiracy to obstruct commerce by robbery or attempted robbery, in violation of 18 U.S.C. § 1951(a).1 On appeal, defendants argue, inter alia, that: (1) the indictment was constructively amended, thereby denying them of their Fifth Amendment right to be indicted by a grand jury; (2) the government failed to present any competent evidence to support the interstate commerce element of the charged offense; and, (8) the district court erred by admitting Bullock’s pre-arrest statement into evidence.2 We find that the convictions must be vacated because the constructive amendment of the indictment constituted plain error.3 In addition to stating our reasons for this conclusion, we address those issues that the district court will necessarily encoun*833ter on remand.4 We assume the parties’ familiarity with the underlying facts and procedural history of this case.
We first consider defendants’ claim that the indictment was constructively amended. It is undisputed that the indictment only charged Pryor and Bullock with conspiracy to commit or attempt to commit a Hobbs Act robbery. Further, the government concedes that the jury was instructed exclusively on the elements of the underlying substantive offenses. Still, the government argues that this Court should not exercise its discretion to correct this error. We disagree.
Where, as here, a defendant fails to raise a constructive amendment claim in the district court, this Court will review only for plain error. United States v. Vebeliunas, 76 F.3d 1283, 1291 (2d Cir.1996). “To establish plain error, the Court must find 1) an error, 2) that is plain, 3) that affects substantial rights.” United States v. Gordon, 291 F.3d 181, 191 (2d Cir.2002). In this Circuit, a “constructive amendment is ... per se prejudicial” for the purpose of the third prong of plain error review. United States v. Thomas, 274 F.3d 655, 670 (2d Cir.2001) (en banc). If the first three elements of the plain error test are met, the “Court engages in a fourth consideration: whether or not to exercise its discretion to correct the error.” Gordon, 291 F.3d at 191. “[P]lain error should be corrected only if it seriously affects the fairness, integrity, or public reputation of judicial proceedings.” Id. (internal quotation marks omitted).
In this case, the government acknowledges that it committed error, that this error was plain, and that under this Circuit’s precedent, the error was presumptively prejudicial. Nevertheless, the government contends that the defendants’ convictions should be affirmed because defendants cannot “demonstrate that the constructive amendment here seriously affected the fairness, integrity, or public reputation of the proceedings below.” Gov’t Br. 22. Specifically, the government argues that nothing unfair transpired because, “[although the indictment charged only a conspiracy to commit both a Hobbs Act robbery and an attempt, [defendants were] convicted of at least one of the objects of that very conspiracy, either the robbery or the attempt to commit the robbery.” Id. This argument lacks merit because it disregards the long-recognized role of indictments as limiting a defendant’s “jeopardy to offenses charged by a group of his fellow citizens acting independently of either prosecuting attorney or judge.” Stirone v. United States, 361 U.S. 212, 218, 80 S.Ct. 270, 4 L.Ed.2d 252 (1960); Sanabria v. United States, 437 U.S. 54, 65-66, 98 S.Ct. 2170, 57 L.Ed.2d 43 (1978) (“The precise manner in which an indictment is drawn cannot be ignored, because an important function of the indictment is to ensure that, ‘in case any other proceedings are taken against [the defendant] for a similar offen[s]e, ... the record [will] sho[w] with accuracy to what extent he may plead a former acquittal or conviction.’ ”) (quoting Cochran v. United States, 157 U.S. 286, 290, 15 S.Ct. 628, 39 L.Ed. 704 (1895)); accord United States v. McCourty, 562 F.3d 458, 470 (2d Cir.2009). Indeed, the government’s brief fails to identify any reason why this Court should conclude that the constructive amendment here did not undermine these important protections, thereby affecting the “fair*834ness, integrity, or public reputation of judicial proceedings,” Gordon, 291 F.3d at 191.5 Accordingly, we vacate the defendants’ convictions.
We turn next to the defendants’ argument that the government failed to present any competent evidence to support the interstate commerce element of the charged offense. It is not contested that Samuel Mercado’s expert testimony was the only evidence from which the jury could have inferred that the interstate commerce element of the Hobbs Act had been proven. Thus, the defendant’s sufficiency argument turns on whether Mercado’s testimony was competent. Specifically, defendants contend that: (1) the district court should not have permitted Mercado to testify as an expert under Federal Rule of Evidence 702; and (2) assuming Mercado is an expert on some subjects, the district court erred by allowing him to testify on topics outside the scope of his expertise, United States v. Mejia, 545 F.3d 179, 190-91 (2d Cir.2008). These arguments lack merit.
While we review a district court’s denial of a Federal Rule of Criminal Procedure 29 motion de novo, United States v. Amico, 486 F.3d 764, 780 (2d Cir.2007), we only review a district court’s decision to admit expert testimony for abuse of discretion, United States v. Lopez, 547 F.3d 364, 372 (2d Cir.2008). Under Federal Rule of Evidence 702, expert testimony based on “scientific, technical, or other specialized knowledge” is admissible “in the form of an opinion or otherwise,” so long as the witness is “qualified as an expert” and (1) “the testimony is based on sufficient facts or data,” (2) “the testimony is the product of reliable principles and methods,” and (3) “the expert has reliably applied the principles and methods reliably to the facts of the case.” Id.
The district court did not abuse its discretion in finding that Mercado was qualified to testify as an expert on the origins of the- cocaine being sold in the United States. Mercado has an impressive background in narcotics law enforcement and substantial firsthand knowledge of the drug trade. Moreover, without Mercado’s testimony, an average juror might not have understood that the cocaine involved in this offense necessarily came from abroad. Indeed, in United States v. Parkes, 497 F.3d 220 (2d Cir.2007), a case on which defendants rely, we found the government’s proof of the interstate element of a Hobbs Act offense to be sufficient where an “experienced narcotics investigator” testified “that marijuana ‘is almost exclusively trucked into the United States, predominately through Mexico’ and that ‘[v]ery little’ marijuana is grown in New York.” Id. at 231.
Finally, we consider whether the district court erred by allowing the government to introduce into evidence Bullock’s pre-arrest statement. Bullock argues that this statement was not voluntarily given because the law enforcement agents with whom he was speaking told him that they were not interested in pursuing robbery charges and that he was not going to be arrested. “When reviewing a district court’s ruling on a motion to suppress *835evidence, we review the court’s factual findings for clear error, viewing the evidence in the light most favorable to the government. The district court’s legal conclusions are reviewed de novo.” United States v. Worjloh, 546 F.3d 104, 108 (2d Cir.2008) (per cu-riam). “Whether a confession is a product of coercion may only be determined after a careful evaluation of the totality of all the surrounding circumstances, including the accused’s characteristics, the conditions of interrogation, and the conduct of law enforcement officials.” United States v. Anderson, 929 F.2d 96, 99 (2d Cir.1991). “Ploys to mislead a suspect or to lull him into a false sense of security that do not rise to the level of compulsion or coercion to speak are not within Miranda’s concerns.” Illinois v. Perkins, 496 U.S. 292, 296, 110 S.Ct. 2394, 110 L.Ed.2d 243 (1990). However, “the Supreme Court has found that affirmative misrepresentations by the police may be sufficiently coercive to invalidate a suspect’s waiver of the Fifth Amendment privilege.” Anderson, 929 F.2d at 100.
The district court did not err in concluding that Bullock’s pre-arrest statement was voluntarily given. As the district court found, to the extent law enforcement officers told Bullock that they were primarily interested in investigating a double homicide rather than crack house robberies, those statements were true. Additionally, nothing in the record indicates that Bullock was promised that he would never be charged with an offense or that his statement would not be used against him. Instead, the investigating officials advised Bullock that he would not be arrested that day and, in accordance with that representation, Bullock was returned to his residence following his interview. In short, Bullock’s pre-arrest statement is not rendered involuntary based on representations law enforcement officials made concerning the priority they assigned to their various investigations.
Accordingly, for the foregoing reasons, the judgment of the district court is hereby VACATED and the case is REMANDED for further proceedings consistent with this Order.