How long does it take to start the investigation after the police station files a case?

"After the case is filed, it takes about 30 days to investigate and collect evidence. The application for investigation and evidence collection shall be filed seven days before the expiration of the time limit for providing evidence designated by the court, and the time for investigation and evidence collection shall be counted within the time limit for court hearing. In cases of first instance, the trial period of ordinary procedure is six months, and the trial period of summary procedure is three months. After filing a case, the time for public security organs to investigate and collect evidence is generally three days, which can be extended by one to four days or at most seven days under special circumstances; For the main criminal suspects who commit crimes on the run, commit crimes many times or commit crimes in collusion, the time for submitting for examination and arrest may be extended to 30 days. At the same time, after investigation and evidence collection, the examination time of the procuratorate will be increased to seven days.

After receiving the report, the public security organ shall immediately examine it, and if it deems it necessary to investigate criminal responsibility, it shall file a case, and the criminal case that has been filed shall be filed for investigation. In other words, after receiving the report, the police station will conduct a preliminary review of the report materials and conduct investigation and evidence collection according to the specific circumstances of the case after filing the case. There is no time limit for the investigation here. Where a criminal suspect is detained, the investigation period shall generally not exceed two months, and may be extended upon approval in special circumstances.

Materials required for filing a case:

1, civil indictment;

2, the main evidence materials directory and copy;

3. 1 Copy of the plaintiff's ID card and provide the original for inspection. If the legal representative represents the lawsuit, he shall submit a copy of his identity card and a copy of his relationship with the plaintiff, and at the same time provide the original for inspection. If there is no identity card, provide other identification materials;

4. If another person is entrusted to represent the lawsuit, submit 1 copy of the power of attorney and the ID card of the trustee, and provide the original for inspection;

5. If a lawyer is entrusted to represent the lawsuit, a clearly authorized power of attorney and a copy of the certificate, letter and lawyer's card of the entrusted law firm shall be submitted;

6. If the defendant is a company, provide the defendant with basic business information.

Legal basis:

People's Republic of China (PRC) Civil Procedure Law

According to article 1 15 of the criminal procedure law:

The public security organ shall investigate the criminal cases that have been put on file, and collect and obtain evidence of the criminal suspect's guilt or innocence, light crime or heavy crime. An active criminal or a major suspect may be detained in advance according to law, and a criminal suspect who meets the conditions for arrest shall be arrested according to law. It can be seen that there are many links that need to be investigated after the criminal case is filed.