This document provides an overview of law enforcement in the United States. It discusses the highly fragmented nature of American policing, with over 18,000 agencies providing police services on the local, county, state and federal levels. It also examines the "industry" perspective of policing, with citizens receiving services from multiple agencies. Additionally, it outlines the various types of agencies that make up the law enforcement system and notes there are no national standards, with regulation occurring at the state level through licensing or certification.