Legal analysis: Yes. The tip-off letter must be realistic. Don't write if there is no evidence, and don't say if there is no textual research. The contents of the tip-off letter must be witnesses, and a copy of physical evidence can be attached to the tip-off letter. The fewer words, the better. The main problem is to be more concise and more logical.

Legal basis: Article 111th of the Criminal Procedure Law of People's Republic of China (PRC). Reports, complaints and reports can be made in writing or orally. The staff who accept the oral report, complaint or report shall make a written record, which shall be signed or sealed by the informant, complainant and informant after being correctly read out. The staff who accept the complaint and report shall explain the legal responsibility of false accusation and frame-up to the complainant and informant. However, as long as it is not fabricating facts and evidence, even if the facts of the accusation and report are different, or even false accusation, it should be strictly distinguished from false accusation. Public security organs, people's procuratorates or people's courts shall ensure the safety of informants, complainants, informants and their close relatives. Informants, complainants and informants who are unwilling to disclose their names and report, accuse and report their acts shall keep them confidential.