snapsurveillance
A double-secret condition of which the person in question is completely unaware; due to an affinity for weapons, knives, modified trucks or harsh language the targeted individual is deemed by friends, family and co-workers as fragile, unstable, and likely to 'snap' into mass-murder mode at any given moment.
Oh shit, Billy's at the gun shop again. Even though he's a surgeon and spent most of his life helpin' folks, there's no tellin' when he's gonna blow...better put that one under snapsurveillance immediately.