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The trouble with using metal detectors on a college campus (aside from the massive breach of privacy) is the sheer logistical nightmare it would create. think of how many entrances there are into the college, the number of students, staff, and faculty who go on and off campus everyday, and then consider all of the pocket change, keys, pocketknives, etc they carry. Then factor in the backpacks and bags they all take with them-these would have to ALL be scanned by x-ray EVERY time a person entered campus, with the enormous lines and cost that creates. Additionally, all of the entrances and x-ray machines would have to manned by trained personnel to operate the machines and guards to make sure that nobody simply ignores the checkpoint or tries to bypass it.
I simply don't see any way of making it practical.