Lou is an officer of Springfield Police Department and by far, the most intelligent and competent officer of the Springfield Police. He is under the command of Commissioner Clancy Wiggum, and often takes the time to point out Wiggum's mistakes (often while a crime or the pursuit of a criminal—is still in progress). In "To Cur, with Love", in a flashback, Lou was young and Clancy Wiggum was a dog catcher.
He crashed the car and Clancy Wiggum said he will be a policeman, but Lou also, said that he will be a policeman when he's grown up. Lou speaks more than his counterpart Eddie. Even though he rarely comes up, when he does he is in a police uniform. Lou once said he wants to leave the force as there is more money in private security; nothing ever becomes of this, though. His favorite on duty beverage is beer.