The drunkard's intention is not wine, and the signature has no evidence effect. Article 43 of the Criminal Procedure Law: Judges, prosecutors and investigators must, in accordance with legal procedures, collect all kinds of evidence that can prove the guilt or innocence of criminal suspects and defendants and the seriousness of crimes. It is strictly forbidden to extort confessions by torture and collect evidence by threats, enticements, deception or other illegal methods. We must ensure that all citizens who are related to or know the case, except in special circumstances, have the conditions to provide evidence objectively and fully, and can recruit them to assist in the investigation.
In addition, article 46 of the Criminal Procedure Law emphasizes evidence, investigation and research, and does not believe in confessions. If only the defendant confesses and there is no other evidence, the defendant cannot be found guilty and punished; If there is no confession from the defendant and the evidence is sufficient and reliable, the defendant may be found guilty and punished.
However, it is really inappropriate for public security organs to obtain evidence in this way, but it is also a gray area, and it is not easy for you to prove that he obtained evidence improperly. You can go to the lawyer's port. Also, I suggest you don't confront the public security organs.