I remember after Columbine, our school used metal detectors for the first time. They've actually had them for years, & got some heat from the Mayor's Office because they waited so long to use them. Anyway, about 1/3 of the school was taken aside as they had everything from pocket knives, to lighters & guns on them. One guy in one of my classes got in trouble for having a taser on him. My friend, who carried the box cutter he used for work, got lucky because he was warned ahead of time about it & threw the box cutter into the bushes.