The number of people who held security clearances for access to classified information increased last year to a new reported high of more than 4.8 million persons as of October 1, 2011, a new intelligence community report to Congress said.
Last year’s annual report, the first official count of security cleared personnel, had indicated that there were over 4.2 million clearances in 2010. That number astonished observers because it surpassed previous estimates by more than a million. (“Number of Security Clearances Soars,” Secrecy News, September 20, 2011).
Read more/learn more: http://www.fas.org/blog/secrecy/2012/07/cleared_population.html