United States Capitol Police

The United States Capitol Police (USCP) is a federal law enforcement agency in the United States with nationwide jurisdiction charged with protecting the United States Congress in the District of Columbia and throughout the United States and its territories. It answers to the Capitol Police Board and is the only law enforcement agency under the legislative branch of the federal government of the United States.
The United States Capitol Police has the primary responsibility for protecting life and property, preventing, detecting, and investigating criminal acts, and enforcing traffic regulations throughout a complex of congressional buildings, parks, and thoroughfares. The Capitol Police has primary jurisdiction within buildings and grounds of the United States Capitol Complex.