Are the appraisal results of Sichuan Ya'an Yazheng Forensic Appraisal Center legally valid? The appraisal results of Sichuan Ya'an Yazheng Forensic Appraisal Center have legal effect. According to relevant public information, the forensic identification agency is legal, and the forensic identification documents issued by the forensic identification agency have legal effect within the scope of the local forensic identification directory. The law stipulates the provisions of the Criminal Procedure Law regarding evidence. Article 48 All materials that can prove the facts of a case are evidence.