Pen. Code, § 1548.2

No demand for the extradition of a person charged with crime in another State shall be recognized by the Governor unless it is in writing alleging that the accused was present in the demanding State at the time of the commission of the alleged crime, and that thereafter he fled from that State. Such demand shall be accompanied by a copy of an indictment found or by information or by a copy of an affidavit made before a magistrate in the demanding State together with a copy of any warrant which was issued thereon; or such demand shall be accompanied by a copy of a judgment of conviction or of a sentence imposed in execution thereof, together with a statement by the executive authority of the demanding State that the person claimed has escaped from confinement or has violated the terms of his bail, probation or parole. The indictment, information, or affidavit made before the magistrate must substantially charge the person demanded with having committed a crime under the law of that State; and the copy of indictment, information, affidavit, judgment of conviction or sentence must be certified as authentic by the executive authority making the demand.