With a camera hidden in a hollowed-out Bible, peeking through the “O” of the word “Holy,” and a pair of rigged reading glasses, Scott Whitney secretly filmed the world behind bars, inside one of Florida’s notoriously dangerous prisons. For four years, the 34-year-old convicted drug trafficker captured daily life on contraband cameras at the Martin Correctional Institution. He smuggled footage dating back to 2017 out of the prison, and titled the documentary “Behind Tha Barb Wire.” The video — given to the Miami Herald — allows the public to see with their own eyes the violence, rampant drug use and...