It is unlawful for any person to possess, store, own or give away any knive or cutting instrument with a blade longer than one and one half inches opening on a central pivot and capable of being opened and locked by one hand commonly known as a “butterfly knife” or any instrument designed to slip onto the hand and commonly known as "brass knuckles” anywhere within the town limits of Oro Valley unless such items are part of a regular exhibit capable of being viewed by the public or are being used as a tool in the regular course of employment. ((O)02-07, 03/20/2002)