Legal analysis: materials that can be used to prove the facts of the case are evidence, such as physical evidence, victim statements, investigation, inspection, identification, investigation and laboratory transcripts. The crime of poisoning, is intentionally put poison, endangering the public **** security behavior. It is only necessary to prove to the public security organs the existence of the facts of the crime, after which the public security organs shall open a case for investigation. The prosecution should have the minimum standard of evidence to accuse the defendant of committing a certain crime and hold him criminally liable, that is to say, it should at least provide the court with enough to recognize the establishment of his criminal facts.

Legal basis: the Chinese People's **** and the State Criminal Procedure Law

Article 50 Materials that can be used to prove the facts of the case are evidence. Evidence includes: (a) physical evidence; (b) documentary evidence; (c) witness testimony; (d) victim statements; (e) confessions and arguments of suspects and defendants; (f) opinions of appraisal; (g) transcripts of investigations, inspections, identifications, and investigative experiments; and (h) audio-visual materials and electronic data. Evidence must be verified as true before it can be used as the basis for a case.

Article 54 The people's courts, people's procuratorates and public security organs have the right to collect and retrieve evidence from relevant units and individuals. The relevant units and individuals shall truthfully provide evidence. Administrative organs in the administrative law enforcement and investigation of cases collected in the process of physical evidence, documentary evidence, audio-visual materials, electronic data and other evidentiary materials can be used as evidence in criminal proceedings. Evidence involving state secrets, commercial secrets and personal privacy shall be kept confidential. Anyone who falsifies evidence, conceals evidence or destroys evidence, regardless of where it belongs, must be prosecuted by law.