Mobile apps with lively law enforcement themes range from crime chasers to sniper shooters — and, of course, there are zombie killers, too.

Alert I received on my police scanner app while vegas shooting was in progress. Multiple shooters and arrests. I listened to the broadcast pic.twitter.com/ww8bFjuUol ...

Seeing the red lights flashing behind you while driving on the highway can immediately make your heart sink, so it's no surprise that a lot of drivers are using police scanners to detect nearby police ...