Even airport scans are typically used only as a secondary security measure, he points out.

FORBES: Magazine Article

The rest present them as a voluntary secondary security option in lieu of a pat-down, which is protocol for those who've repeatedly set off the metal detector or have been randomly selected for additional screening.

CNN: Airport security bares all, or does it?

Rep. FRANK: To sell into the secondary market - this is where prepayment has come in - when people buy a security in the secondary market, they want some assurance that they're going to have that income through a number of years.

NPR: Time for Renovation at the FHA?