Legal basis: "Criminal Procedure Law of the People's Republic of China"
Article 148: After the public security organs have filed a case, based on the needs of investigating the crime, they can go through strict approval procedures. Adopt technical investigation measures for crimes endangering national security, terrorist activities, organized crime of a mafia nature, major drug crimes, or other crimes that seriously endanger society.
After the People's Procuratorate files a case, based on the needs of criminal investigation and through strict approval procedures, it can take technical investigation measures for major cases of corruption and bribery and major cases of serious infringement of citizens' personal rights committed by taking advantage of their powers. Transfer it to relevant authorities for execution in accordance with regulations.
To pursue fugitive criminal suspects and defendants who are wanted or have been approved for arrest, technical investigation measures necessary for the pursuit may be taken upon approval.
Article 149 The approval decision shall determine the types and applicable objects of technical investigation measures based on the needs of investigating crimes. The approval decision is valid for three months from the date of issuance. If there is no need to continue to take technical investigation measures, they should be lifted in time; for complex and difficult cases, if technical investigation measures still need to be continued after the expiration of the time limit, the validity period can be extended with approval, and each time shall not exceed three months.