Man uses drones to expose one of America’s “biggest secrets”.

Within a few weeks of its release, this investigation by Speciesism: The Movie director Mark Devries had been viewed by millions worldwide, and received major global press coverage.

Mark Devries has been secretly using spy drones to investigate and expose the environmental devastation caused by factory farms.  In this investigation, the drones capture shocking aerial video footage of several massive facilities that supply pigs for Smithfield Foods.

Check out the video below and prepare for a shocking discovery.

Man uses drones to expose one of America's "biggest secrets".