From Diabetes Health magazine:
"While the machines have been certified as safe by the FDA and outside observers, travelers can choose to opt out of using them (some have raised concerns about radiation). But if passengers opt out (or if the machines raise an alarm), they are subjected to a thorough patdown. These comprehensive body searches are the second change introduced by the TSA and are the focal point of recent outrage."
http://www.diabeteshealth.com/read/2010/12/23/6990/traveling-with-a-pump-tsa-regulations/