If, during a hearing of a tribunal or court, a document in the proceedings, or a document produced, is alleged to be forged, the court shall decide, after hearing the observations of the public prosecutor and the parties, whether or not to stay the proceedings until a decision on the forgery has been made by the competent court.
If the public prosecution is extinguished or cannot be brought on the grounds of forgery, and if it does not appear that the person who produced the document knowingly made use of a forgery, the court or tribunal hearing the main action shall rule incidentally on the character of the document alleged to be vitiated by forgery.