article_snippet.sent: This image taken from the  app on an iPhone, in Washington, shows police at the scene on a map on the app .
article_snippet.sent: Before the killing he was known to have used the app to monitor the movements of police .
article_snippet.sent: However, several police officers say the app is being used to stalk and plan attacks on law enforcement.
article_snippet.sent: Before the killing he was known to have used the appto monitor the movements of police officers and posted screenshots of the app on Instagram.
article_snippet.sent: After typing in their destination address, users just drive with the app open on their phone to passively contribute traffic and other road data, but their can also take a more active role by sharing road reports on accidents, police traps, or any other hazards along the way, helping to give other users in the area a 'heads-up' about what's to come.
article_snippet.sent: Google claims the app 'is all about contributing to the 'common good' out there on the road,' the risks far outweigh the potential benefits, reports CNN.
highlights_snippet.sent: App, owned by Google, also warns drivers when police are nearby .