Ava DuVernay, a filmmaker and activist best known for Selma, tells us why the US has less than 5% of the world’s population but almost 25% of the world’s prisoners and why one out of four African-American males will serve prison time at some point in their lives. Her latest documentary about the prison industrial complex sheds light on a convenient loophole that was drafted into the 13th amendment of the constitution, which states in full: “Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.”