Former Homeland Security secretary Michael Chertoff promoted the scanners as a solution all the while profiting from them. According to the Washington Post:
Chertoff’s advocacy for the technology dates back to his time in the Bush administration. In 2005, Homeland Security ordered the government’s first batch of the scanners—five from California-based Rapiscan Systems. Today, 40 body scanners are in use at 19 U.S. airports. The number is expected to skyrocket at least in part because of the Christmas Day incident. The Transportation Security Administration this week said it will order 300 more machines. In the summer, TSA purchased 150 machines from Rapiscan with $25 million in American Recovery and Reinvestment Act funds.