P1) For all x, x is a booby-trap if, and only if, x is a device or material AND x is designed, constructed, or adapted to kill or injure AND x functions (as a device or material that was designed, constructed, or adapted to kill or injure) when a person disturbs or approaches an apparently safe act.
(∀x(Bx↔(Dx∧Kx∧Fx)))
P2) The pagers were devices or materials.
(Dp)
P3) The pagers were designed, constructed, or adapted to kill or injure.
(Kp)
P4) The pagers did not function (as devices or materials that were designed, constructed, or adapted to kill or injure) when a person disturbs or approaches an apparently safe act.
(¬Fp)
C) Therefore, the pagers were not booby-traps.
(∴¬Bp)