Perhaps via Zip drives? Oh that's right... flash storage is smaller than the rivets in my jeans nowadays. Will my denim jeans be confiscated next time I pass through a checkpoint? I like my jeans (and the privacy they afford my genitalia) and the rivets are used purely to keep them on my hips.
Likely that would show up on a body scanner just fine. There's one idea to get to spend some time up close and personal with a security guard. And if you want to pursue this idea to its logical conclusion it might get uncomfortable in a hurry.
