Originally Posted by Flyertall

Once near the screening machines, the uniforms change to TSA, and it is TSA personnel who are actually putting your ID under the special light. And it is TSA who is staring at the xrays of your carryon on the belt as well as the carrion behind the belt you removed.

I've observed the security uniform differences between the sheep herders at the beginning of the line, versus the screeners at the machines, even in SFO. But then again, things change, and it has been a few months since I've flown from there. Yet I'm excited to pay my first visit to the new SFO SC next month!