Most of the few U.S.airports that possess body scanning capability are using the technology for secondary screening of passengers who warrant closer examination by TSA officers.
VOA: standard.2009.12.30
One recent examination of primary and secondary buyouts in Europe between 1989 and 2006 found that the median IRR for the secondary buyouts was 32 percent, not far below the 36 percent the primary buyouts earned (see figure below).