This is where I think NFC may finally be useful. If cops show up, I slide my phone by a hidden NFC tag, and an http request is sent to my desktop machine. Everything incriminating is wiped and the computer is turned off, before the cops can walk to the room.
Where I am, having a networked machine cemented up in the wall is the national pastime, for when a bunch of masked policemen show up with automatic rifles. As for what’s on that machine, that’s another national sport because no one is paying for those bastards to harass businesses.