US Border Patrol: Pros & Cons The U.S. Border Patrol is the organization that polices the entry of illegal immigrants into our country. The official mission of the United States Border patrol is to protect the boundaries of the United States by preventing illegal entry, and by detecting, interdicting, and apprehending illegal aliens, smugglers, and contraband. Today, the United States Border Patrol consists of 21 sectors. Each sector is headed by a chief patrol agent. There are 145 stations located throughout the continental United States, and in Puerto Rico. The Border Patrol controls the border by land, sea, and air. The Border Pat