The directors of "Making A Murderer" appeared on "Late Night with Stephen Colbert" on Tuesday night to discuss their hit Netflix documentary.

Netflix typically doesn't reveal viewership stats, but the show has been a top search term on Google and has inspired over 400,000 people to sign a petition to free Steven Avery, the Wisconsin man at the center of the series. Avery was convicted in the murder of Teresa Halbach in 2007, but there's evidence that the state mishandled his trial.

One of the reasons "Making A Murderer" is so popular is the fierce debate it has sparked over whether or not Avery is actually guilty. But the filmmakers behind the series aren't conflicted.

"My personal opinion is that the state did not meet its burden," co-director Laura Ricciardi said. "I would say in my opinion not guilty."

Colbert pointed out that it might not be as black and white as guilty or not. Rather, the uncertainty could be better described as "proven or not proven."

Co-director Moira Demos agreed.

"There are things he could be guilty [of]," Demos said. "Is he guilty beyond a reasonable doubt? Nothing I've seen, and I've seen a lot of stuff, nothing I've seen has convinced me of that."

Demos also offered a strong warning about the flaws in the U.S. criminal justice system.

"This could happen to anyone of us," Demos said. "And good luck if that happens."

Watch a clip from the interview above.

CORRECTION: A previous version of this article misidentified Laura Ricciardi as Danielle Ricciardi.

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