When communities attempt to police the police, they often get, well... policed.

In several states, organized groups that use police scanners and knowledge of checkpoints to collectively monitor police activities by legally and peacefully filming cops on duty have said they've experienced retaliation, including unjustified detainment and arrests as well as police intimidation.

The groups operate under many decentralized organizations, most notably CopWatch and Cop Block, and have proliferated across the United States in the last decade - and especially in the aftermath of the events that continue to unfold in Ferguson, Missouri, after officer Darren Wilson fatally shot unarmed, black teenager Michael Brown.

Many such groups have begun proactively patrolling their communities with cameras at various times during the week, rather than reactively turning on their cameras when police enter into their neighborhoods or when they happen to be around police activity.