Legal analysis: the scope of witnesses in the criminal procedure law includes: except for the following scope, people in other scopes are not allowed to be witnesses in criminal proceedings. 1, the person who has an interest in the case and may affect the fair handling of the case. 2. People who are physically and mentally defective or young, do not have the corresponding ability to distinguish or cannot express correctly. 3. Staff members of public security and judicial organs who exercise the functions and powers of criminal proceedings or personnel employed by them.

Legal basis: Article 133 of the Criminal Procedure Law of People's Republic of China (PRC) shall be written in a written record, which shall be signed or sealed by the participants and witnesses.

Article 139 During a search, the person being searched or his family members, neighbors or other witnesses shall be present. A search of a woman's body shall be conducted by female staff.

Article 140 The record of a search shall be signed or sealed by the investigator and the searched person or his family members, neighbors or other witnesses. If the searched person or his family is at large or refuses to sign or seal, it shall be indicated in the record.