The procedures that Gansu police should follow when applying for a criminal certificate include: issuing a certificate from the neighborhood committee of the place of residence; calling the police, signing and sealing; and going to the police station for final signature and sealing. my country's Criminal Procedure Law stipulates that if a person is under 18 years old at the time of the crime and is sentenced to a fixed-term imprisonment of less than five years, the relevant criminal records must be sealed.