[wbshaw]

I have heard for years that this is a common tactic used by TSA when you get selected for special screening. Basically, they couldn't force you to divulge your unlock code. However, if you left your phone in a vulnerable state w/r/t biometrics, they could unlock your phone on your behalf without permission.

Mine gets a quick reboot for going into a checkpoint. This disables biometrics until I enter a passcode.