Article R249-20 of the French Code of Criminal Procedure
I.-The request is declared by the requesting party or his lawyer in the following manner: 1° Where the applicant is remanded in custody, the declaration is made to the investigating judge’s registry if an investigation is underway, to the public prosecutor’s secretariat if the criminal court is seised, or to the public prosecutor’s secretariat if the criminal appeals chamber or the assize court is seised or if an appeal in…