I dunno. I pretty much carried at least one, if not two, knives when I was in the Army, every day. And that was in the rear. I carried a leatherman and a SAK in a holder on my belt. No one ever questioned it, most people had a knife on their belt anyhow. And companies are worried about potentially violent people carrying knives? I know for a fact the Homeless Depot want you to carry a company issued box knife, that almost could cut someone if you weren't careful with it, a full 1/32 of the tip of the blade is exposed - to cut tape I guess.

Stupid companies let stupider people make rules so they can point to having done something on their annual performance review.