The American criminal justice system enforces our laws and keeps watch over us - but who is watching the system? Award-winning filmmaker Joe Berlinger examines the state of America's criminal justice system.

The fates of two men are still entangled in the FBI's faulty hair analysis from 20 years ago.

Both men were found guilty of multiple murders and now one is on the outside, recently released and waiting for a retrial, while the other, after coming within hours of actual execution, is hoping that long-awaited DNA testing will finally prove his innocence.

 
This episode of The System can be seen from Thursday, January 1, 2015 at the following times GMT: Thursday: 2000; Friday: 1200; Saturday: 0100; Sunday: 0600; Monday: 2000; Tuesday: 1200; Wednesday: 0100; Thursday: 0600.

Source: Al Jazeera