Since 2001, the Federal Government has increased funding for port security by 700%, according to the Department of Homeland Security. This increase in funding has allowed the Department of Homeland Security to implement what it calls a "layered defense" against threats of terrorism. Under the new security procedures, U.S. Customs and Border Protection, the U.S. Coast Guard, Terminal Operator, and the Port Authority all share responsibility for protecting American ports. According to the Department of Homeland Security, these agencies screen 100% of all cargo that enters the United States. U.S. Customs and Border Patrol utilizes X-ray, gamma ray machines, and radiation detection devices to screen cargo. Presently, CBP operates over 680 radiation portal monitors at American ports. It also uses over 170 large scale non-intrusive inspection devices to examine cargo and has issued 12,400 hand-held radiation detection devices to their agents. Finally, more than 600 canine teams that "can identify narcotics, bulk currency, human beings, explosives, agricultural pests, and chemical weapons" are working to secure at U.S. ports of entry. All these programs and tactics are used to secure Americans from the importation of weapons of mass destruction into the United States.