Body cameras can capture evidence against criminals, with a potentially exonerating or damning record of evidence for law enforcement officers.

In the wake of the events in Ferguson, Missouri, more than 7,000 police agencies around the country have purchased body cameras with the help of federal grants.

Reveal reporters Ali Winston and Amy Walters take a look inside the camera, at the evidence trail left behind. Because where there are a lot of video cameras, there’s a lot of information – and money.

Winston and Walters also head to Seattle to find out how Taser International Inc., an industry leader in body cameras, plans to manage this massive cloud of video data.