This free detailed PDF report discussed the GAO recommendations and details TSA/DHS plans to roll out a significantly greater number of AIT (Advanced Imaging technology) whole body scanners, comments added by RFG.  The plans to spend 2.4 billion in deployment could translate to perhaps 20,000 scanners installed over the life of the program.  The implications of mass deployment at bus, train, airport terminals are great.    

Just enter 0 for the price.  Original source statements of Mr. Steve Lord, Director Homeland Security and Justice Issues.