1.4 million: The total number of people with top-security clearance.
More than 4.9 million: The number of federal government workers and contractors with security clearances in 2012.
More than $1 billion: The amount the Office of Personnel Management (OPM) received in 2011 to conduct more than 2 million background investigations.
$4,005: The base price for a top secret clearance investigation conducted by the OPM in 2012.
$260: The base price of a secret clearance conducted by the OPM.
18: The number of OPM and contract background investigators and record searchers who have been criminally convicted.
54: The number of defense department contractors criminally charged with fraud between 2001 and 2011.