In this episode of Four Corners "Gaming The Games", an investigation by Hagar Cohen, uncovers a scandal that goes to the heart of the Paralympic Games.

The Paralympics have become the world's third biggest sporting event, generating tens of millions of dollars in revenue and sponsorships.

Reporter Hagar Cohen speaks to former athletes and high-ranking officials who tell her the system that's meant to ensure a level playing field for Paralympians, is flawed and easily manipulated.

The insiders describe a culture where classification rules are regularly bent and broken, with few repercussions.

They fear that without substantial reform, athletes who follow the rules will continue to be robbed of the chance to compete and win.