What if there is insufficient evidence in the investigation stage?

Legal analysis: the method of insufficient evidence in investigation stage: 1. In the course of investigation, if it is found that the criminal suspect should not be investigated for criminal responsibility, the case should be dismissed; 2. A criminal suspect who has been arrested shall be released immediately, issued with a release certificate, and notified to the people's procuratorate that originally approved the arrest.

Legal basis: Criminal Procedure Law of People's Republic of China (PRC).

163rd in the process of investigation, it is found that the criminal suspect should not be investigated for criminal responsibility, and the case should be dismissed; A criminal suspect who has been arrested shall be released immediately, issued with a release certificate and notified to the people's procuratorate that originally approved the arrest.

Article 166 A people's procuratorate shall interrogate a person detained in a case directly accepted within 24 hours after detention. If it is found that it should not be detained, it must be released immediately and a release certificate will be issued.