When Amy Meyer saw a sick cow being pushed by a bulldozer outside a slaughterhouse, she did what any of us would in this age of iPhones and Instagram - she filmed it.

Meyer, 25, knew it was not only cruel, it was a public safety risk.

Will Potter. Credit:Fernando Moneta

Similar video footage had resulted in the largest meat recall in US history, when it was revealed that cows too sick to walk were being fed to school children as part of the national school lunch program.

Instead of being praised for exposing this, Meyer was prosecuted.