Criminal justices and law enforcement share a lot in common across many different nations, but at the same time there are plenty of differences between them. Law enforcement in the United States differs compared to other countries in the world because of it’s structure, organization and even practice of police agencies.The most striking difference in policing between United States law enforcement and other countries law enforcement are categorized as centralized and decentralized. The United States reflects a decentralized system in which there are multiple levels of law enforcement and police services, all of which are essentially independent from each other.In the U.S., every political subdivision has the ability to provide police services, so that almost every city, town, village, county, and state has at least one or multiple law enforcement agencies, all of whom operate within their own chains of command. These organization often cooperate with each other, perform different services and are not responsible to one another. There are approximately 17,000 different police forces within the U.S., making our nation perhaps the most decentralized country in the world with regard to policing.AgenciesThe law enforcement agencies administered by the Department of Justice include:United States Marshal Service.Federal Bureau of Investigation.Federal Bureau of Prisons.Bureau of Alcohol, Tobacco, Firearms, and Explosives.Drug Enforcement Administration.Office of Inspector General.United States law enforcement ranksAlthough the large and varied number of federal, state, and local police and sheriff’s departments have different ranks, a general model, from highest to lowest rank, would be:Chief of police/police commissioner/superintendent/sheriff;Assistant Chief of Police/Assistant Commissioner/Assistant Superintendent;Deputy Chief of Police/Deputy Commissioner/Deputy Superintendent/Chief Deputy/undersheriff;Inspector/commander;Colonel;Major/deputy inspector;Captain;Lieutenant;Sergeant;Detective/Inspector/Investigator;Officer/Deputy/Trooper/Corporal.