Originally Posted by Cass314

SFO terminal three has two checkpoints near the United check-in area, one upstairs and one downstairs. If you walk past (to the left, if you're facing away from the curb) of the main checkpoint near United, down the stairs, and then turn and walk back again in the direction you came, there's a second, smaller checkpoint. It's mostly used by vendors and employees, but I went through it recently (Sunday) because the line was shorter than the one upstairs and it didn't seem to have any of the new machines.