opinion: Me. Chief Justice Buegek
  delivered the opinion of the Court.
  We granted certiorari to determine whether the courts of an asylum state may nullify the executive grant of extradition on the ground that the demanding state failed to show a factual basis for its charge supported by probable cause. 435 U. S. 967 (1978).
  (1)
  On December 18, 1975, Doran was arrested in Michigan and charged with receiving and concealing stolen property. Mich. Comp. Laws § 750.535 (1970). The charge rested on Doran’s possession of a stolen truck bearing California license plates, which he had driven from Arizona. Michigan notified Arizona authorities of Doran’s arrest and sent them a photograph of Doran taken on the day of his arrest. On January 7, 1976, a sworn complaint was filed with an Arizona Justice of the Peace, charging Doran with the theft of the described motor vehicle, Ariz. Rev. Stat. Ann. §§ 13-661 to 13-663, 13-672 (A) (Supp. 1957-1977), or, alternatively, with theft by embezzlement, § 13-682 (Supp. 1957-1977). The Justice of the Peace issued an arrest warrant which stated that she had found “reasonable cause to believe that such offense(s) were committed and that [Doran] committed them . . . .”
  While the Michigan charges were pending, Doran was arraigned in Michigan on January 12 as a fugitive. A magistrate extended Doran’s detention as a fugitive to provide time to receive the expected request for extradition from Arizona. On February 11 the Governor of Arizona issued a requisition for extradition. Attached to the requisition were the arrest warrant, two supporting affidavits, and the original complaint on which the charge was based. The Governor of Michigan issued a warrant for Doran’s arrest and his extradition was ordered.
  Doran was arraigned on the Michigan warrant on March 29. He then petitioned the arraigning court for a writ of habeas corpus, contending that the extradition warrant was invalid because it did not comply with the Uniform Criminal Extradition Act. Mich Comp. Laws §§ 780.1 to 780.31 (1970). Cf. Ariz. Rev. Stat. Ann. §§ 13-1301 to 13-1328 (Supp. 1957-1977). The court twice denied a writ of habeas corpus; the Michigan Court of Appeals denied an application for leave to appeal and dismissed Doran’s complaint for habeas corpus. People v. Doran, Nos. 28507 (May 4, 1976) and 30516 (Nov. 22, 1976). The Michigan Supreme Court, however, granted leave to appeal the denial of the first habeas corpus petition. People v. Doran, 397 Mich. 886 (1976). On review, the court reversed the trial court's order and mandated Doran’s immediate release. In re Doran, 401 Mich. 235, 258 N. W. 2d 406, rehearing denied, 402 Mich. 951 (1977).
  (2)
  The Michigan Supreme Court reasoned that because a significant impairment of liberty occurred whenever a person was arrested in one state and extradited to another that impairment must be preceded by a showing of probable cause to believe that the fugitive had committed a crime. In addition to relying on Gerstein v. Pugh, 420 U. S. 103 (1975), the court found support for its conclusion in § 3 of the Uniform Criminal Extradition Act, Mich. Comp. Laws § 780.3 (1970), which requires that an affidavit must “substantially charge” the fugitive with having committed a crime under the law of the demanding state. That court construed “substantially charge” to mean there must be a showing of probable cause.
  The essence of the holding of the Supreme Court of Michigan is that the courts of an asylum state may review the action of the governor and in that process re-examine the factual basis for the finding of probable cause which accompanies the requisition from the demanding state. The court concluded:
  “In the case at bar, there is no indictment or document reflecting a prior judicial determination of probable cause. The Arizona complaint and arrest warrant are both phrased in conclusory language which simply mirrors the language of the pertinent Arizona statutes. More importantly, the two supporting affidavits fail to set out facts which could justify a Fourth Amendment finding of probable cause for charging [Doran] with a crime.” 401 Mich., at 240-242, 258 N. W. 2d, at 408-409 (footnote omitted).
  The Michigan court assumed that arrest warrants could be issued in Arizona without a preliminary showing of probable cause since this was said to happen often in Michigan. In that court’s view, neither the complaint which generated the Arizona charge, the affidavits in support of the Arizona arrest warrant, nor the recitals of the Arizona judicial officer set out sufficient facts to show probable cause. We disagree and we reverse.
  (3)
  We turn to the question of the power of the courts of an asylum state to review the finding of probable cause made by a judicial officer in the demanding state. Article IV, § 2, cl. 2, of the United States Constitution on the subject of extradition is clear and explicit:
  “A Person charged in any State with Treason, Felony, or other Crime, who shall flee from Justice, and be found in another State, shall on Demand of the executive Authority of the State from which he fled, be delivered up, to be removed to the State having Jurisdiction of the Crime.”
  To implement this provision of the Constitution, see Innes v. Tobin, 240 U. S. 127, 131 (1916); Trigg v. Pennsylvania, 16 Pet. 639, 617 (1842), Congress has provided:
  “Whenever the executive authority of any State or Territory demands any person as a fugitive from justice, of the executive authority of any State, District or Territory to which such person has fled, and produces a copy of an indictment found or an affidavit made before a magistrate of any State or Territory, charging the person demanded with having committed treason, felony, or other crime, certified as authentic by the governor or chief magistrate of the State or Territory from whence the person so charged has fled, the executive authority of the State, District or Territory to which such person has fled shall cause him to be arrested and secured, and notify the executive authority making such demand, or the agent of such authority appointed to receive the fugitive, and shall cause the fugitive to be delivered to such agent when he shall appear.” 18 U. S. C. § 3182 (emphasis added).
  The Extradition Clause was intended to enable each state to bring offenders to trial as swiftly as possible in the state where the alleged offense was committed. Biddinger v. Commissioner of Police, 245 IT. S. 128, 132-133 (1917); Appleyard v. Massachusetts, 203 U. S. 222, 227 (1906). The purpose of the Clause was to preclude any state from becoming a sanctuary for fugitives from justice of another state and thus “balkanize” the administration of criminal justice among the several states. It articulated, in mandatory language, the concepts of comity and full faith and credit, found in the immediately preceding clause of Art. IV. The Extradition Clause, like the Commerce Clause, served important national objectives of a newly developing country striving to foster national unity. Compare Biddinger, supra, with McLeod v. Dilworth Co., 322 U. S. 327, 330 (1944). In the administration of justice, no less than in trade and commerce, national unity was thought to be served by de-emphasizing state lines for certain purposes, without impinging on essential state autonomy.
  Interstate extradition was intended to be a summary and mandatory executive proceeding derived from the language of Art. IV, § 2, cl. 2, of the Constitution. Biddinger, supra, at 132; In re Strauss, 197 U. S. 324, 332 (1905); R. Hurd, A Treatise on the Right of Personal Liberty and the Writ of Habeas Corpus 598 (1858). The Clause never contemplated that the asylum state was to conduct the kind of preliminary inquiry traditionally intervening between the initial arrest and trial.
  Near the turn of the century this Court, after acknowledging the possibility that persons may give false information to the police or prosecutors and that a prosecuting attorney may act “either wantonly or ignorantly,” concluded:
  “While courts will always endeavor to see that no such attempted wrong is successful, on the other hand, care must be taken that the process of extradition be not so burdened as to make it practically valueless. It is but one step in securing the presence of the defendant in the court in which he may be tried, and in no manner determines the question of guilt.” In re Strauss, supra, at 332-333.
  Whatever the scope of discretion vested in the governor of an asylum state, cf. Kentucky v. Dennison, 24 How. 66, 107 (1861), the courts of an asylum state are bound by Art. IV, § 2, cf. Compton v. Alabama, 214 U. S. 1, 8 (1909), by § 3182, and, where adopted, by the Uniform Criminal Extradition Act. A governor’s grant of extradition is prima facie evidence that the constitutional and statutory requirements have been met. Cf. Bassing v. Cady, 208 U. S. 386, 392 (1908). Once the governor has granted extradition, a court considering release on habeas corpus can do no more than decide (a) whether the extradition documents on their face are in order; (b) whether the petitioner has been charged with a crime in the demanding state; (c) whether the petitioner is the person named in the request for extradition; and (d) whether the petitioner is a fugitive. These are historic facts readily verifiable.
  Under Arizona law, felony prosecutions may be commenced either by an indictment or by filing a complaint before a judicial officer. Ariz. Rule Crim. Proc. 2.2 (1973). The magistrate or justice of the peace before whom the criminal charge is filed must issue an arrest warrant if it is determined that there is reasonable cause to believe that an offense has been committed. The inquiry the judicial officer is required to make is directed at the traditional determination of reasonable grounds or probable cause. Erdman v. Superior Court, 102 Ariz. 524, 433 P. 2d 972 (1967); State v. Currier, 86 Ariz. 394, 347 P. 2d 29 (1959). Here the Justice of the Peace in Arizona, having the complaint at hand, issued the warrant for Doran’s arrest after concluding that there was “reasonable cause to believe that such offense(s) were committed and that the accused committed them.”
  The Supreme Court of Michigan, however, held that the conclusion was deficient because it did not recite the factual basis for the determination made by the Arizona judicial officer. This holding finds no support in the record read in the light of the mandatory provisions of Art. IV, § 2, cl. 2, and Arizona law. Moreover it overlooks the “conclusory language” in which criminal charges are ordinarily cast whether by indictment or otherwise. Cf. Ex parte Reggel, 114 U. S. 642, 651 (1885).
  Under Art. IV, § 2, the courts of the asylum state are bound to accept the demanding state’s judicial determination since the proceedings of the demanding state are clothed with the traditional presumption of regularity. In short, when a neutral judicial officer of the demanding state has determined that probable cause exists, the courts of the asylum state are without power to review the determination. Section 2, cl. 2, of Art. IV, its companion clause in § 1, and established principles of comity merge to support this conclusion. To allow plenary review in the asylum state of issues that can be fully litigated in the charging state would defeat the plain purposes of the summary and mandatory procedures authorized by Art. IV, § 2. See, e. g., Sweeney v. Woodall, 344 U. S. 86, 90 (1952); Marbles v. Creecy, 215 U. S. 63, 69-70 (1909); Pierce v. Creecy, 210 U. S. 387, 404-405 (1908).
  We hold that once the governor of the asylum state has acted on a requisition for extradition based on the demanding state’s judicial determination that probable cause existed, no further judicial inquiry may be had on that issue in the asylum state.
  Accordingly, the judgment of the Michigan Supreme Court is reversed, and the case is remanded to that court for further proceedings not inconsistent with this opinion.
  Reversed and remanded.
  Michigan dismissed its criminal charges against Doran on February 9 in deference to the extradition on charges pending in Arizona.
  At 'the time of his release, Doran had been in custody for 18 months in Michigan pending the extradition proceedings and his challenge to them. Doran’s counsel moved to dismiss certiorari in this Court on the ground of mootness due to her inability to locate him in Michigan. That motion is denied. Cf. Eagles v. United States ex rel. Samuels, 329 U. S. 304, 306-308 (1946).
  In Gerstein we held that “the Fourth Amendment requires a judicial determination of probable cause as a prerequisite to extended restraint of liberty following arrest.” 420 U. S., at 114. Because Arizona provided a judicial determination of probable cause for the arrest warrant, we need not decide whether the criminal charge on which extradition is requested must recite that it was based on a finding of probable cause.
  These terms appear to derive from language in Munsey v. Clough, 196 U. S. 364, 373 (1905): “If it appear that the indictment substantially charges an offense for which the person may be returned to the State for trial, it is enough for this [extradition] proceeding.” See also Pearce v. Texas, 155 U. S. 311, 313 (1894); Uniform Criminal Extradition Act §3, 11 U. L. A. 93 (1974).
  See, e. g., Kirkland, v. Preston, 128 U. S. App. D. C. 148, 385 F. 2d 670 (1967).
  Section 3182 remains virtually unchanged from the original version enacted in 1793. 1 Stat. 302. See also Rev. Stat. § 5278; 18 U. S. C. §662 (1940 ed.).
  The Arizona justice of the peace may, if necessary, subpoena additional witnesses before issuing a warrant. Ariz. Rev. Stat. Ann. § 22-311 (1975); Ariz. Rules Crim. Proc. 2.4, 3.1, 3.2 (1973 and Supp. 1978-1979). The Arizona Rules of Criminal Procedure require that on a finding of probable cause the judicial officer shall issue a warrant reciting the information on which it is based. Rules 3.1 and 3.2 (1973).
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