https://techcrunch.com/2018/09/28/us-government-loses-bid-to-force-facebook-to-wiretap-messenger-calls/

US government investigators have lost a case to force Facebook to wiretap calls made over its Messenger app.

A joint federal and state law enforcement effort investigating the MS-13 gang had pushed a district court to hold the social networking giant in contempt of court for refusing to permit real-time listening in on voice calls.