Where can I watch Dream/Killer in United States?

In 2005, 20-year-old Ryan Ferguson was convicted and sentenced to 40 years in prison for a crime he did not commit. dream/killer is the story of how his father Bill embarked on 10-year campaign to prove Ryan’s innocence. The film is chock-full of incredible characters. From the questionable District Attorney Kevin Crane, and the highly-confused witness Chuck Erickson, to the high-powered Chicago attorney Kathleen Zellner, the doc depicts both a highly flawed justice system, as well as one that can work brilliantly.