Should it be legal for the secret service or government to use "pive scanning" to detect legally-armed folk?

The ironic thing about the 'right to bare arms', is that it is also used as a justification for increased state security & surveillance. You can't have one without the other. If you want the right to wear a Glock under your blazer then I'm afraid you're going to have put up with the secret service microwaving you from time to time.