Would be good if said scanner could test politicians for bullshit.
Oh wait, we don't need to test em' for that, do we!
Okay, can this gadget tell us how deep it is, then?
Seriously, though, this little scanner could prove ever-so useful in hundreds of situations across the spectrum. As has already been suggested, the authorities checking suspects for drugs, etc, but more importantly, how useful such a device could be for doctors who need quick results in order to complete a diagnosis of patients presenting with various ailments/symptoms, etc.