Article 22
The evidence in writing, or the declarations given on oath or not, or certified copies of such evidence or declarations, and the warrant of arrest and the other legal documents establishing the fact of the conviction, shall be admitted as valid evidence in examining the request for extradition, if they have been signed by a judge or official of the requesting State or if they are accompanied by a certificate issued by such a judge or official or if they have been authenticated by the seal of the Ministry of Justice.