Director Mark Silver’s new documentary “3 1/2 Minutes” is already causing a buzz at Sundance. The film looks at Michael Dunn’s shooting of black teenager Jordan Davis and everything that followed, including his parents’ search for justice in a criminal justice system that’s notoriously biased against black people in America.

In this segment from “Democracy Now,” Davis’ parents talk with Amy Goodman about their son’s case and the impact of the film.