[He keys in a secure code almost absently, like it's on autopilot. There's no way to say this without risking freaking the kid himself out, but at least they can forestall city-wide panic.]

That you need a neural scan. We've had transdimensional crap, but as far as I know, no one's ever displaced a double who's already been active.

[He grimaces slightly.]

This could be a first, but I'd rather rule out one of our friendly neighbourhood telepaths screwing with your head before assuming we have a whole new problem.