It's all well and good to have police officers and police cars outfitted with cameras -- but it's even better if citizens have the added layer of protection that comes from cameras beyond police control. This way, there is less chance that a critical piece of footage will go missing after someone is injured or dies at the hands of police due to the mysterious "malfunctioning" of the camera at the precise time the police brutality went down.
The Hands Up App can be deployed on the down low during an encounter with law enforcement and the footage automatically uploaded to Facebook or Dropbox. So even if the police officer discovers the camera and confiscates the phone, any critical footage will be stored in the cloud. All someone needs to do is place the cell phone on the dash of the car and the cell phone will proceed with photographing police brutality even though the camera appears to be off.
The ACLU's stop and frisk app records police encounters that can turn ugly and also can be used to alert people nearby that police brutality is happening. The Five-O App enables citizens to rate their encounters with police. Citizens can use the app to say both good and bad comments about cops and this is helpful because it encourages good behavior as well as discourages bad behavior.
Most police brutality cell phone apps also have "know your rights" sections, which provide people with invaluable advice about how to best handle a police encounter and avoid possible police brutality.