Can the public security bureau find out the contents of previous calls?

Legal analysis: Under normal circumstances, the public security bureau can't find the content of the call, only the call record of the mobile phone number. If you want to inquire about the telephone conversation, you must ask the internal leaders of the Public Security Bureau to issue relevant documents, and then contact the communication operator to monitor a certain number. In the case of monitoring, your call content and short messages will be monitored and queried. Now with the development of science and technology, although we can't find the past telephone content, we can use GPS and bugs to detect eavesdropping. Short messages can be checked and deleted.

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

Article 149 The time for psychiatric appraisal of a criminal suspect shall not be counted in the time limit for handling a case.

Article 150 After putting a case on file, the public security organ may, according to the needs of investigating crimes and through strict approval procedures, take technical investigation measures against crimes endangering national security, terrorist activities, organized crimes of underworld nature, major drug crimes or other crimes seriously endangering society. After filing a case, the people's procuratorate may, according to the needs of investigating crimes and through strict approval procedures, take technical investigation measures and hand them over to the relevant authorities for execution in accordance with regulations. To hunt down a criminal suspect or defendant who is wanted at large or whose arrest has been approved, the necessary technical investigation measures may be taken upon approval.