Since this is an old post, the laws may have changed (did in the case of assisted knives) but regardless, I see two issues here.
1) What is legal to carry that might be concealed (i.e. pocket knife) AND
2) What might be carried out in the open (i.e. not concealed)
What if someone has a spring assisted knife that is, say has a 4" blade. But say the knife is kept in the open, outside of a pocket, and perhaps just hanging from a belt loop. Would that be legal or illegal? What specific law is being violated, if you think it's illegal?
The law for penalties says "furtively" with intent to conceal.