The career of Donald "D.J." Vodicka encompassed the rapid expansion of the prison system. For sixteen years, he was a prison guard in California's highest security prisons, serving meals to gang leaders, serial killers in lockdown cells, and patrolling exercise yards filled with violent felons while unarmed and outnumbered 1000-to-2. He belonged to an elite unit called the Investigative Services Unit (Internal Affairs), responsible for solving horrific crimes inside the walls. He was a decorated veteran officer. He became the largest "whistle-blower" to uncover a group of rogue prison guards who called themselves "The Green Wall."The Green Wall" is a real-life drama of one man's courage to do the right thing against the California State Prison System. It is an unblinking look at what can go wrong when only one person is willing to stand up and speak for what is right, against almost insurmountable odds. Vodicka's televised state senate testimony exposed a scandal that led to resignations, transfers, sudden retirements, and reforms of the system that are still underway. The story is a classic tale of the triumph of personal integrity in the most dishonest place imaginable.