Comment by NewJazz

2 hours ago

This depends on the beacon being visible. If they just take the phone and walk away, because that's where they think the evidence is, it won't wipe.

When I've gotten secondary screening the first thing they do is take all my belongings and rifle through them on a table. That seems to be standard practice and I'm sure it was step 1 in Tunick's ordeal.

Both approaches have situations they wouldn't work in. If you're extra paranoid you could do both.