Privacy advocates say the practice exposes ordinary people to ever more scrutiny by authorities while skirting legal protections designed to limit the government's collection and use of personal data.
Critics acknowledge that such data can be vital to law enforcement or intelligence investigations of specific targets but question the usefulness of "data-mining" software that combs huge amounts of information in the hopes of finding links and patterns that might pick someone out as suspicious.
http://www.washingtonpost.com/wp-dyn/content/article/2006/06/14/AR2006061402063.html?nav=mb
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