Patent ID: 7750631

Claim:
A method for detecting a weapon in at least one of a first shoe and a second shoe worn by a person, the method comprising: positioning the first shoe and the second shoe within an inspection system comprising a first metal detector trace and a second metal detector trace, the first metal detector trace mounted substantially horizontally on a first sidewall of the inspection system with current that flows in a first direction, and the second metal detector trace mounted substantially horizontally on a second sidewall of the inspection system opposite the first sidewall with current that flows in a second direction; generating at a predetermined quadrupole resonance frequency a first magnetic field around the first shoe by energizing the first metal detector trace to scan the first shoe; simultaneously generating at the predetermined quadrupole frequency a second magnetic field around the second shoe by energizing the second metal detector trace to scan the second shoe simultaneously with the first shoe; generating a quadrupole resonance current in at least one electrically conductive trace positioned below at least one of the first shoe and the second shoe; and detecting a perturbation in the quadrupole resonance current when a weapon is present on at least one side of a longitudinal medial plane that bisects the inspection system.