A study of British and U.S. police by Cambridge University shows a 93 percent decrease in the number of complaints made against officers when they are using body cameras.

Researchers suggest that cameras encourage best behavior on the part of both the officers and the public.

The study involved West Midlands Police, West Yorkshire Police, Cambridgeshire Constabulary, Police Service of Northern Ireland and departments in Ventura, California, and Rialto, California. Some 2,000 officers and 1.4 million working hours were studied over a year.

Barak Ariel, who led the research, says the idea behind the study is simple: people who are being observed — and know it — change their behavior.

Ariel says that "everyone is recording the police except themselves. Now we have something from the officer's point of view."