A police department will be the branch of government interested in enforcement of law and protection against crime. The phrase police department means the central organization which takes good care of the functioning of countless sub agencies under it. Within a vast and extensive country just like the US, each state carries a separate police department that takes care of maintaining legislation and order. The authorities department plays a pivotal role inside the smooth functioning of the law and order machinery inside the respective state. The United States of America features a amount of police departments that function towards preserving peace and security.