the system is primarily used for mail sorting, but the images are available for possible use by law enforcement agencies. Created in 2001 following the anthrax attacks that killed five people, it is a sweeping expansion of a 100-year-old program called "mail cover" which targets people suspected of crimes. The FBI developed the computer programs "Magic Lantern" and CIPAV, which they can remotely install on a computer system, in order to monitor a person's computer activity. The NSA has been gathering information on financial records, Internet surfing habits, and monitoring e-mails. They have also performed extensive analysis of social networks such as Myspace. The PRISM special source operation system legally immunized private companies that cooperate voluntarily with U.S. intelligence collection. According to The Register, the FISA Amendments Act of 2008 "specifically authorizes intelligence agencies to monitor the phone, email, and other communications of U.S. citizens for up to a week without obtaining a warrant" when one of the parties is outside the U.S. PRISM was first publicly revealed on 6 June 2013, after classified documents about the program were leaked to The Washington Post and The Guardian by American Edward Snowden. The Communications Assistance for Law Enforcement Act (CALEA) requires that all U.S. telecommunications and Internet service providers modify their networks to allow easy wiretapping of telephone, VoIP, and broadband Internet traffic. In early 2006, USA Today reported that several major telephone companies were providing the telephone call records of U.S. citizens to the National Security Agency (NSA), which is storing them in a large database known as the NSA call database. This report came on the heels of allegations that the U.S. government had been conducting electronic surveillance of domestic telephone calls without warrants. In 2013, the existence of the Hemisphere Project, through which AT&T provides telephone call data to federal agencies, became publicly known. Traffic cameras, which were meant to help enforce traffic laws at intersections, may be used by law enforcement agencies for purposes unrelated to traffic violations. Some cameras allow for the identification of individuals inside a vehicle and license plate data to be collected and time stamped for cross reference with other data used by police. The Department of Homeland Security is funding networks of surveillance cameras in cities and towns as part of its efforts to combat terrorism. The New York City Police Department infiltrated and compiled dossiers on protest groups before the 2004