Not quite true. There were recent stories that the LAPD commissioner was calling for Waze to remove police tracking from their app. [1] There was a callout of two NYPD officers being killed in December by a shooter that used Waze before the attacks, but did not use it to track their locations leading up to and during shootings.

[1] - http://hosted.ap.org/dynamic/stories/U/US_POLICE_TRACKING_AP...