1. The case that can be revoked is that in the process of investigation, if it is found that the criminal suspect should not be investigated for criminal responsibility, the case should be revoked;
2. The case that a case cannot be dismissed is that a criminal fact has indeed occurred, and criminal responsibility needs to be investigated according to law. There is no case that a case can be dismissed legally.
According to the regulations, if the public security organ finds any of the following circumstances during the investigation, it shall promptly withdraw the case:
1. Within 12 months from the date of lifting the compulsory measures against the criminal suspect, it is still unable to be transferred for examination and prosecution or otherwise dealt with according to law;
2, the criminal suspect has not taken compulsory measures, within two years from the date of filing the case, still can not be transferred for review and prosecution or other treatment according to law;
3, the people's Procuratorate notice to cancel the case;
4. Other circumstances that comply with the law to cancel the case. Criminal Procedure Law of the People's Republic of China
Article 16
In any of the following circumstances, criminal responsibility shall not be investigated, and if it has been investigated, the case shall be dismissed, or prosecution shall not be initiated, or the trial shall be terminated, or the case shall be declared innocent: (1) The circumstances are obviously minor and the harm is not great, and it is not considered a crime; (two) the crime has passed the limitation period;
(3) Being exempted from punishment by an amnesty order;
(4) Failing to tell or withdrawing a crime that should be dealt with only after being told according to the Criminal Law;
(5) The criminal suspect or defendant dies;
(six) other laws and regulations shall be exempted from criminal responsibility.