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By Nickerson, Amanda B Martens, Matthew P Abstract. This study examined the extent to which three approaches to violence prevention and response were associated with the incidence of school crime and disruption after accounting for the influence of demographic variables.
A metal detector is a device that finds metal that may not be visible. The basic metal detector is composed of an oscillator producing an alternating current that passes through the coil producing an alternating magnetic field. If electrically conductive metal is close to the coil then the magnetic field is disrupted and thus the metal detector can sense the hidden metal. The first metal detectors were developed in the 1960s and were used for mining and other industries. They were used...
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