"Robocop" Bill Melendez was fired from multiple police departments, sued in a dozen different cases of extreme police misconduct, and was still hired by yet another police department in Michigan where he beat a black grandfather and attempted to plant drugs on him. He has since been charged with three felonies and terminated, but only after a life of misconduct.
Jeff Roorda was fired for falsifying reports as a police officer in Missouri, then literally moved one county over and became a small town police chief. He's now a key leader in the St. Louis Police Union in spite of his previous misconduct.