[657]*657Chief Justice Rehnquist
delivered the opinion of the Court.
The issue in this case is whether a criminal defendant, abducted to the United States from a nation with which it has an extradition treaty, thereby acquires a defense to the jurisdiction of this country’s courts. We hold that he does not, and that he may be tried in federal district court for violations of the criminal law of the United States.
Respondent, Humberto Alvarez-Machain, is a citizen and resident of Mexico. He was indicted for participating in the kidnap and murder of United States Drug Enforcement Administration (DEA) special agent Enrique Camarena-Salazar and a Mexican pilot working with Camarena, Alfredo Zavala-Avelar.1 The DEA believes that respondent, a medical doctor, participated in the murder by prolonging Agent Camare-na’s life so that others could further torture and interrogate him. On April 2, 1990, respondent was forcibly kidnaped from his medical office in Guadalajara, Mexico, to be flown by private plane to El Paso, Texas, where he was arrested by DEA officials. The District Court concluded that DEA agents were responsible for respondent’s abduction, although they were not personally involved in it. United States v. Caro-Quintero, 745 F. Supp. 599, 602-604, 609 (CD Cal. 1990).2
[658]*658Respondent moved to dismiss the indictment, claiming that his abduction constituted outrageous governmental conduct, and that the District Court lacked jurisdiction to try him because he was abducted in violation of the extradition treaty between the United States and Mexico. Extradition Treaty, May 4, 1978, [1979] United States-United Mexican States, 31 U. S. T. 5059, T. I. A. S. No. 9656 (Extradition Treaty or Treaty). The District Court rejected the outrageous governmental conduct claim, but held that it lacked jurisdiction to try respondent because his abduction violated the Extradition Treaty. The District Court discharged respondent and ordered that he be repatriated to Mexico. 745 F. Supp., at 614.
The Court of Appeals affirmed the dismissal of the indictment and the repatriation of respondent, relying on its decision in United States v. Verdugo-Urquidez, 939 F. 2d 1341 (CA9 1991), cert. pending, No. 91-670. 946 F. 2d 1466 (1991). In Verdugo, the Court of Appeals held that the forcible abduction of a Mexican national with the authorization or participation of the United States violated the Extradition Treaty between the United States and Mexico.3 Although the Treaty does not expressly prohibit such abductions, the Court of Appeals held that the “purpose” of the Treaty was violated by a forcible abduction, 939 F. 2d, at 1350, which, along with a formal protest by the offended nation, would give a defendant the right to invoke the Treaty violation to defeat jurisdiction of the District Court to try him.4 The Court of Appeals further held that the proper remedy for [659]*659such a violation would be dismissal of the indictment and repatriation of the defendant to Mexico.
In the instant case, the Court of Appeals affirmed the District Court’s finding that the United States had authorized the abduction of respondent, and that letters from the Mexican Government to the United States Government served as an official protest of the Treaty violation. Therefore, the Court of Appeals ordered that the indictment against respondent be dismissed and that respondent be repatriated to Mexico. 946 F. 2d, at 1467. We granted certiorari, 502 U. S. 1024 (1992), and now reverse.
Although we have never before addressed the precise issue raised in the present case, we have previously considered proceedings in claimed violation of an extradition treaty and proceedings against a defendant brought before a court by means of a forcible abduction. We addressed the former issue in United States v. Rauscher, 119 U. S. 407 (1886); more precisely, the issue whether the Webster-Ashburton Treaty of 1842, 8 Stat. 576, which governed extraditions between England and the United States, prohibited the prosecution of defendant Rauscher for a crime other than the crime for which he had been extradited. Whether this prohibition, known as the doctrine of specialty, was an intended part of the treaty had been disputed between the two nations for some time. Rauscher, 119 U. S., at 411. Justice Miller delivered the opinion of the Court, which carefully examined the terms and history of the treaty; the practice of nations in regards to extradition treaties; the case law from the States; and the writings of commentators, and reached the following conclusion:
“[A] person who has been brought within the jurisdiction of the court by virtue of proceedings under an extradition treaty, can only be tried for one of the offences described in that treaty, and for the offence with which he is charged in the proceedings for his extradition, until a reasonable time and opportunity have been given him, [660]*660after his release or trial upon such charge, to return to the country from whose asylum he had been forcibly taken under those proceedings.” Id., at 430 (emphasis added).
In addition, Justice Miller’s opinion noted that any doubt as to this interpretation was put to rest by two federal statutes which imposed the doctrine of specialty' upon extradition treaties to which the United States was a party. Id., at 423.5 Unlike the case before us today, the defendant in Rauscher had been brought to the United States by way of an extradition treaty; there was nojssue of a forcible abduction.
In Ker v. Illinois, 119 U. S. 436 (1886), also written by Justice Miller and decided the same day as Rauscher, we addressed the issue of a defendant brought before the court by way of a forcible abduction. Frederick Ker had been, tried and convicted in an Illinois, court for larceny; his presence before the court was procured by means of forcible abduction from Peru. A messenger was sent to Lima with the proper warrant to demand Ker by yirtue of the extradition treaty between Peru and the United States: The messenger, however, disdained reliance on-the treaty processes,, and instead forcibly kidnaped Ker and brought him to the United States.6 We distinguished Ker’s case from Rauscher, on the basis that Ker was not brought into the United States by virtue of the extradition treaty between the United States and Peru, and rejected Ker’s argument that- he had a right [661]*661under the extradition treaty to be returned to this country only in accordance with its terms.7 We rejected Ker’s due process argument more broadly, holding in line with “the highest authorities” that “such forcible abduction is no sufficient reason why the party should not answer when brought within the jurisdiction of the court which has the right to try him for such an offence, and presents no valid objection to his trial in such court.” Ker, supra,
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[657]*657Chief Justice Rehnquist
delivered the opinion of the Court.
The issue in this case is whether a criminal defendant, abducted to the United States from a nation with which it has an extradition treaty, thereby acquires a defense to the jurisdiction of this country’s courts. We hold that he does not, and that he may be tried in federal district court for violations of the criminal law of the United States.
Respondent, Humberto Alvarez-Machain, is a citizen and resident of Mexico. He was indicted for participating in the kidnap and murder of United States Drug Enforcement Administration (DEA) special agent Enrique Camarena-Salazar and a Mexican pilot working with Camarena, Alfredo Zavala-Avelar.1 The DEA believes that respondent, a medical doctor, participated in the murder by prolonging Agent Camare-na’s life so that others could further torture and interrogate him. On April 2, 1990, respondent was forcibly kidnaped from his medical office in Guadalajara, Mexico, to be flown by private plane to El Paso, Texas, where he was arrested by DEA officials. The District Court concluded that DEA agents were responsible for respondent’s abduction, although they were not personally involved in it. United States v. Caro-Quintero, 745 F. Supp. 599, 602-604, 609 (CD Cal. 1990).2
[658]*658Respondent moved to dismiss the indictment, claiming that his abduction constituted outrageous governmental conduct, and that the District Court lacked jurisdiction to try him because he was abducted in violation of the extradition treaty between the United States and Mexico. Extradition Treaty, May 4, 1978, [1979] United States-United Mexican States, 31 U. S. T. 5059, T. I. A. S. No. 9656 (Extradition Treaty or Treaty). The District Court rejected the outrageous governmental conduct claim, but held that it lacked jurisdiction to try respondent because his abduction violated the Extradition Treaty. The District Court discharged respondent and ordered that he be repatriated to Mexico. 745 F. Supp., at 614.
The Court of Appeals affirmed the dismissal of the indictment and the repatriation of respondent, relying on its decision in United States v. Verdugo-Urquidez, 939 F. 2d 1341 (CA9 1991), cert. pending, No. 91-670. 946 F. 2d 1466 (1991). In Verdugo, the Court of Appeals held that the forcible abduction of a Mexican national with the authorization or participation of the United States violated the Extradition Treaty between the United States and Mexico.3 Although the Treaty does not expressly prohibit such abductions, the Court of Appeals held that the “purpose” of the Treaty was violated by a forcible abduction, 939 F. 2d, at 1350, which, along with a formal protest by the offended nation, would give a defendant the right to invoke the Treaty violation to defeat jurisdiction of the District Court to try him.4 The Court of Appeals further held that the proper remedy for [659]*659such a violation would be dismissal of the indictment and repatriation of the defendant to Mexico.
In the instant case, the Court of Appeals affirmed the District Court’s finding that the United States had authorized the abduction of respondent, and that letters from the Mexican Government to the United States Government served as an official protest of the Treaty violation. Therefore, the Court of Appeals ordered that the indictment against respondent be dismissed and that respondent be repatriated to Mexico. 946 F. 2d, at 1467. We granted certiorari, 502 U. S. 1024 (1992), and now reverse.
Although we have never before addressed the precise issue raised in the present case, we have previously considered proceedings in claimed violation of an extradition treaty and proceedings against a defendant brought before a court by means of a forcible abduction. We addressed the former issue in United States v. Rauscher, 119 U. S. 407 (1886); more precisely, the issue whether the Webster-Ashburton Treaty of 1842, 8 Stat. 576, which governed extraditions between England and the United States, prohibited the prosecution of defendant Rauscher for a crime other than the crime for which he had been extradited. Whether this prohibition, known as the doctrine of specialty, was an intended part of the treaty had been disputed between the two nations for some time. Rauscher, 119 U. S., at 411. Justice Miller delivered the opinion of the Court, which carefully examined the terms and history of the treaty; the practice of nations in regards to extradition treaties; the case law from the States; and the writings of commentators, and reached the following conclusion:
“[A] person who has been brought within the jurisdiction of the court by virtue of proceedings under an extradition treaty, can only be tried for one of the offences described in that treaty, and for the offence with which he is charged in the proceedings for his extradition, until a reasonable time and opportunity have been given him, [660]*660after his release or trial upon such charge, to return to the country from whose asylum he had been forcibly taken under those proceedings.” Id., at 430 (emphasis added).
In addition, Justice Miller’s opinion noted that any doubt as to this interpretation was put to rest by two federal statutes which imposed the doctrine of specialty' upon extradition treaties to which the United States was a party. Id., at 423.5 Unlike the case before us today, the defendant in Rauscher had been brought to the United States by way of an extradition treaty; there was nojssue of a forcible abduction.
In Ker v. Illinois, 119 U. S. 436 (1886), also written by Justice Miller and decided the same day as Rauscher, we addressed the issue of a defendant brought before the court by way of a forcible abduction. Frederick Ker had been, tried and convicted in an Illinois, court for larceny; his presence before the court was procured by means of forcible abduction from Peru. A messenger was sent to Lima with the proper warrant to demand Ker by yirtue of the extradition treaty between Peru and the United States: The messenger, however, disdained reliance on-the treaty processes,, and instead forcibly kidnaped Ker and brought him to the United States.6 We distinguished Ker’s case from Rauscher, on the basis that Ker was not brought into the United States by virtue of the extradition treaty between the United States and Peru, and rejected Ker’s argument that- he had a right [661]*661under the extradition treaty to be returned to this country only in accordance with its terms.7 We rejected Ker’s due process argument more broadly, holding in line with “the highest authorities” that “such forcible abduction is no sufficient reason why the party should not answer when brought within the jurisdiction of the court which has the right to try him for such an offence, and presents no valid objection to his trial in such court.” Ker, supra, at 444.
In Frisbie v. Collins, 342 U. S. 519, rehearing denied, 343 U. S. 937 (1952), we applied the rule in Ker to a case in which the defendant had been kidnaped in Chicago by Michigan officers and brought to trial in Michigan. We upheld the conviction over objections based on the Due Process Clause and the federal Kidnaping Act and stated:
“This Court has never departed from the rule announced in [Ker] that the power of a court to try a person for crime is not impaired by the fact that he had been brought within the court’s jurisdiction by reason of a ‘forcible abduction.’ No persuasive reasons are now presented to justify overruling this line of cases. They [662]*662rest on the sound basis that due process of law is satisfied when one present in court is convicted of crime after having been fairly apprized of the charges against him and after a fair trial in accordance with constitutional procedural safeguards. There is nothing in the Constitution that requires a court to permit a guilty person rightfully convicted to escape justice because he was brought to trial against his will.” Frisbie, supra, at 522 (citation and footnote omitted).8
The only differences between Ker and the present case are that Ker was decided on the premise that there was no governmental involvement in the abduction, 119 U. S., at 443; and Peru, from which Ker was abducted, did not object to his prosecution.9 Respondent finds these differences to be dispositive, as did the Court of Appeals in Verdugo, 939 F. 2d, at 1346, contending that they show that respondent’s prosecution, like the prosecution of Rauscher, violates the implied terms of a valid extradition treaty. The Government, on the other hand, argues that Rauscher stands as an “exception” to the rule in Ker only when an extradition treaty is invoked, and the terms of the treaty provide that its breach will limit the jurisdiction of a court. Brief for United States 17. Therefore, our first inquiry must be whether the abduction of respondent from Mexico violated the Extradition Treaty between the United States and Mexico. If we conclude that the Treaty does not prohibit respondent’s abduction, the rule in Ker applies, and the court need not inquire as to how respondent came before it.
[663]*663In construing a treaty, as in construing a statute, we first look to its terms to determine its meaning. Air France v. Saks, 470 U. S. 392, 397 (1985); Valentine v. United States ex rel. Neidecker, 299 U. S. 5, 11 (1936). The Treaty says nothing about the obligations of the United States and Mexico to refrain from forcible abductions of people from the territory of the other nation, or the consequences under the Treaty if such an abduction occurs. Respondent submits that Article 22(1) of the Treaty, which states that it “shall apply to offenses specified in Article 2 [including murder] committed before and after this Treaty enters into force,” 31 U. S. T., at 5073-5074, evidences an intent to make application of the Treaty mandatory for those offenses. However, the more natural conclusion is that Article 22 was included to ensure that the Treaty was applied to extraditions requested after the Treaty went into force, regardless of when the crime of extradition occurred.10
More critical to respondent’s argument is Article 9 of the Treaty, which provides:
“1. Neither Contracting Party shall be bound to deliver up its own nationals, but the executive authority of the requested Party shall, if not prevented by the laws of that Party, have the power to deliver them up if, in its discretion, it be deemed proper to do so.
“2. If extradition is not granted pursuant to paragraph 1 of this Article, the requested Party shall submit the case to its competent authorities for the purpose of prosecution, provided that Party has jurisdiction over the offense.” Id., at 5065.
[664]*664According to respondent, Article 9 embodies the terms of the bargain which the United States struck: If the United States wishes to prosecute a Mexican national, it may request that individual’s extradition. Upon a request from the United States, Mexico may either extradite the individual or submit the case to the proper authorities for prosecution in Mexico. In this way, respondent reasons, each nation preserved its right to choose whether its nationals would be tried in its own courts or by the courts of the other nation. This preservation of rights would be frustrated if either nation were free to abduct nationals of the other nation for the purposes of prosecution. More broadly, respondent reasons, as did the Court of Appeals, that all the processes and restrictions on the obligation to extradite established by the Treaty would make no sense if either nation were free to resort to forcible kidnaping to gain the presence of an individual for prosecution in a manner not contemplated by the Treaty. Verdugo, supra, at 1350.
We do not read the Treaty in such a fashion. Article 9 does not purport to specify the only way in which one country may gain custody of a national of the other country for the purposes of prosecution. In the absence of an extradition treaty, nations are under no obligation to surrender those in their country to foreign authorities for prosecution. Rauscher, 119 U. S., at 411-412; Factor v. Laubenheimer, 290 U. S. 276, 287 (1933); cf. Valentine v. United States ex rel. Neidecker, supra, at 8-9 (United States may not extradite a citizen in the absence of a statute or treaty obligation). Extradition treaties exist so as to impose mutual obligations to surrender individuals in certain defined sets of circumstances, following established procedures. See 1 J. Moore, A Treatise on Extradition and Interstate Rendition § 72 (1891). The Treaty thus provides a mechanism which would not otherwise exist, requiring, under certain circumstances, the United States and Mexico to extradite individuals to the [665]*665other country, and establishing the procedures to be followed when the Treaty is invoked.
The history of negotiation and practice under the Treaty also fails to show that abductions outside of the Treaty constitute a violation of the Treaty. As the Solicitor General notes, the Mexican Government was made aware, as early as 1906, of the Ker doctrine, and the United States’ position that it applied to forcible abductions made outside of the terms of the United States-Mexico Extradition Treaty.11 Nonetheless, the current version of the Treaty, signed in 1978, does not attempt to establish a rule that would in any way curtail the effect of Ker.12 Moreover, although language which would grant individuals exactly the right sought by respondent had been considered and drafted as [666]*666early as 1935 by a prominent group of legal scholars sponsored by the faculty of Harvard Law School, no such clause appears in the current Treaty.13
Thus, the language of the Treaty, in the context of its history, does not support the proposition that the Treaty prohibits abductions outside of its terms. The remaining question, therefore, is whether the Treaty should be interpreted so as to include an implied term prohibiting prosecution where the defendant’s presence is obtained by means other than those established by the Treaty. See Valentine, 299 U. S., at 17 (“Strictly the question is not whether there had been a uniform practical construction denying the power, but whether the power had been so clearly recognized that the grant should be implied”).
Respondent contends that the Treaty must be interpreted against the backdrop of customary international law, and that international abductions are “so clearly prohibited in international law” that there was no reason to include such a clause in the Treaty itself. Brief for Respondent 11. The international censure of international abductions is further evidenced, according to respondent, by the United Nations Charter and the Charter of the Organization of American States. Id., at 17. Respondent does not argue that these sources of international law provide an independent basis for the right respondent asserts not to be tried in the United States, but rather that they should inform the interpretation of the Treaty terms.
[667]*667The Court of Appeals deemed it essential, in order for the individual defendant to assert a right under the Treaty, that the affected foreign government had registered a protest. Verdugo, 939 F. 2d, at 1357 (“[I]n the kidnapping case there must be a formal protest from the offended government after the kidnapping”)- Respondent agrees that the right exercised by the individual is derivative of the nation’s right under the Treaty, since nations are authorized, notwithstanding the terms of an extradition treaty, to voluntarily render an individual to the other country on terms completely outside of those provided in the treaty. The formal protest, therefore, ensures that the “offended” nation actually objects to the abduction and has not in some way voluntarily rendered the individual for prosecution. Thus the Extradition Treaty only prohibits gaining the defendant’s presence by means other than those set forth in the Treaty when the nation from which the defendant was abducted objects.
This argument seems to us inconsistent with the remainder of respondent’s argument. The Extradition Treaty has the force of law, and if, as respondent asserts, it is self-executing, it would appear that a court must enforce it on behalf of an individual regardless of the offensiveness of the practice of one nation to the other nation. In Rauscher, the Court noted that Great Britain had taken the position in other cases that the Webster-Ashburton Treaty included the doctrine of specialty, but no importance was attached to whether or not Great Britain had protested the prosecution of Rauscher for the crime of cruel and unusual punishment as opposed to murder.
More fundamentally, the difficulty with the support respondent garners from international law is that none of it relates to the practice of nations in relation to extradition treaties. In Rauscher, we implied a term in the Webster-Ashburton Treaty because of the practice of nations with regard to extradition treaties. In the instant case, respond[668]*668ent would imply terms in the Extradition Treaty from the practice of nations with regards to international law more generally.14 Respondent would have us find that the Treaty acts as a prohibition against a violation of the general principle of international law that one government may not “exercise its police power in the territory of another state.” Brief for Respondent 16. There are many actions which could be taken by a nation that would violate this principle, including waging war, but it cannot seriously be contended that an invasion of the United States by Mexico would violate the terms of the Extradition Treaty between the two nations.15
In sum, to infer from this Treaty and its terms that it prohibits all means of gaining the presence of an individual [669]*669outside of its terms goes beyond established precedent and practice. In Rauscher, the implication of a doctrine of specialty into the terms of the Webster-Ashburton Treaty, which, by its terms, required the presentation of evidence establishing probable cause of the crime of extradition before extradition was required, was a small step to take. By contrast, to imply from the terms of this Treaty that it prohibits obtaining the presence of an individual by means outside of the procedures the Treaty establishes requires a much larger inferential leap, with only the most general of international law principles to support it. The general principles cited by respondent simply fail to persuade us that we should imply in the . United States-Mexico Extradition Treaty a term prohibiting international abductions.
Respondent and his amici may be correct that respondent’s abduction was “shocking,” Tr. of Oral Arg. 40, and that it may be in violation of general international law principles. Mexico has protested the abduction of respondent through diplomatic notes, App. 33-38, and the decision of whether respondent should be returned to Mexico, as a matter outside of the Treaty, is a matter for the Executive Branch.16 We [670]*670conclude, however, that respondent’s abduction was not in violation of the Extradition Treaty between the United States and Mexico, and therefore the rule of Ker v. Illinois is fully applicable to this case. The fact of respondent’s forcible abduction does not therefore prohibit his trial in a court in the United States for violations of the criminal laws of the United States.
The judgment of the Court of Appeals is therefore reversed, and the case is remanded for further proceedings consistent with this opinion.'
So ordered.