Internal Homeland Security documents describing specifications for border-crossing scanners, which emit gamma or X-ray radiation to probe vehicles and their occupants, are raising new health and privacy concerns, CNET has learned. 

 

Even though a public outcry has prompted Homeland Security to move away from adding X-ray machines to airports--it purchased 300 body scanners last year that used alternative technology instead--it appears to be embracing them at U.S.-Mexico land border crossings as an efficient way to detect drugs, currency, and explosives.