N.Y. CPL Law § 570.08

§ 570.08 Demand; form.\n No demand for the extradition of a person charged with crime in\nanother state shall be recognized by the governor unless in writing\nalleging that the accused was present in the demanding state at the time\nof the commission of the alleged crime, and that thereafter he fled from\nthe state, except in cases arising under section 570.14 or 570.16, and\naccompanied by a copy of an indictment found or by information supported\nby an affidavit in the state having jurisdiction of the crime, or by a\ncopy of an affidavit made before a magistrate there, together with a\ncopy of any warrant which was issued thereon, or by a copy of a judgment\nof conviction or of a sentence imposed in execution thereof, together\nwith a statement by the executive authority of the demanding state that\nthe person claimed has escaped from confinement or has broken the terms\nof his bail, probation or parole. The indictment, information or\naffidavit made before the magistrate must substantially charge the\nperson demanded with having committed a crime under the law of that\nstate; and the copy of the indictment, information, affidavit, judgment\nof conviction or sentence must be authenticated by the executive\nauthority making the demand.\n