After receiving a pat-down, TSA chief John Pistole acknowledges to Senate panel that the method is more invasive than what travelers are used to, but defends the measure as the best security for travelers. | VIDEO TSA: No Religious Excuses in ScreeningImages From Full-Body Scanners Hit the WebOPINION: Forget Body Scans — Let's ProfileYOU DECIDE: Worst Security Method?HAPPENING NOW: Click to Join Live Town Hall