Legal analysis: the investigation process of criminal police fraud is as follows: after the public security organ reports the case, it will first review it and then decide whether to file a case. If the public security organ considers that there are criminal facts that need to be investigated for criminal responsibility and belong to its own jurisdiction, it shall make a report on the filing of a criminal case and file the case with the approval of the person in charge of the public security organ at or above the county level; After examination, it is considered that there is no criminal fact, or the circumstances of the crime are obviously minor, so it is not necessary to pursue criminal responsibility, or there are other circumstances in which criminal responsibility is not pursued according to law, it shall make a petition report that does not file a case, and shall not file a case after being approved by the person in charge of the public security organ at or above the county level; If a complainant decides not to file a case, the public security organ shall make a notice of not filing a case and serve it on the complainant within seven days. If the complainant refuses to accept the decision not to file a case, he may apply for reconsideration to the original public security organ within seven days after receiving the notice of not filing a case. The public security organ that originally decided shall make a decision within ten days after receiving the application for reconsideration, and notify the complainant in writing. The second stage is investigation, and the public security organ can take criminal detention on the flagrante delicto or major suspect. Detainees should be questioned within 24 hours after detention. A criminal suspect may hire a lawyer to provide him with legal advice, complaints and accusations after the first interrogation by the investigation organ or from the day when compulsory measures are taken. The entrusted lawyer has the right to know the charges charged by the criminal suspect from the investigation organ, and can meet the criminal suspect in custody and get information from the criminal suspect. If the public security organ deems it necessary to arrest the detained person, it shall submit it to the people's procuratorate for examination and approval within three days after detention. Under special circumstances, the approval time can be extended by one to four days. For major suspects who commit crimes on the run, commit crimes many times or commit crimes in collusion, the time for submitting for examination and approval may be extended to 30 days. The people's procuratorate shall, within seven days after receiving the approval letter from the public security organ, make a decision on whether to approve or disapprove the arrest. If the people's procuratorate does not approve the arrest, the public security organ shall immediately release it after receiving the notice and promptly notify the people's procuratorate to execute it. Those who need to continue the investigation and meet the conditions of obtaining a guarantor pending trial or residential surveillance shall be granted a guarantor pending trial or residential surveillance according to law. If the suspect is arrested, the lawyer hired can apply for bail pending trial. The public security organ shall not detain a criminal suspect for more than two months after his arrest. If the case is complicated and cannot be concluded at the expiration of the time limit, it may be extended for one month with the approval of the people's procuratorate at the next higher level. When investigating a closed case, the public security organ shall ensure that the facts of the crime are clear and the evidence is true and sufficient, write a prosecution opinion and transfer it to the people's procuratorate at the same level for examination and decision together with the case file and evidence.
Legal basis: Article 266 of the Criminal Law of People's Republic of China (PRC) defrauds public or private property, and if the amount is relatively large, he shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.