The thing is criminals know this which means leave their phone powered off at home when doing anything remotley criminal or associating with others in the game.

The thing is criminals know this which means leave their phone powered off at home when doing anything remotley criminal or associating with others in the game. Where as with warrant tapping they could just avoid being on the cops' radar. Cops are using this to find bad guys not to investigate them. Which makes their job of catching career and methodical criminals harder but it does make it easier to catch most opportunistic and accidental criminals as well as many victimless crime suspects