Legal basis: Article 151 of the Criminal Procedure Law of People's Republic of China (PRC) determines the types and applicable objects of technical investigation measures according to the needs of investigating crimes. The approval decision is valid for three months from the date of issuance. Those who do not need to continue to take technical investigation measures shall be lifted in time; For complex and difficult cases, if technical investigation measures need to be taken after the expiration of the time limit, the validity period may be extended after approval, and each time shall not exceed three months.
Article 152 of the Criminal Procedure Law of People's Republic of China (PRC) * * * Technical investigation measures must be implemented in strict accordance with the types, applicable objects and time limit of the approved measures. Investigators should keep confidential the state secrets, business secrets and personal privacy they know in the process of taking technical investigation measures; Materials irrelevant to the case obtained through technical investigation must be destroyed in time. The materials obtained by technical investigation measures can only be used for investigation, prosecution and trial of crimes, and shall not be used for other purposes. The public security organs shall take technical investigation measures according to law, and the relevant units and individuals shall cooperate with them and keep the relevant information confidential.