The National Police Agency's white paper for 2014 has stressed the need for police to consider the introduction of conversation monitoring — as distinguished from ordinary communications interception — as a new means of investigation.
In ordinary communications interception, a special device is connected with a communications circuit to pick up telephone conversations, text messages through email, and so on. In conversation monitoring, a tiny transmitter would be installed somewhere to eavesdrop on people who the police think have committed or are going to commit a crime.
A panel for reform of criminal investigation and trials under the Legislative Council, an advisory body for the justice minister, has already decided to increase the scope of crimes for which investigative communications interception should be used and to introduce a communications interception system that doesn't require the presence of a person from a communications service provider.