For what it is worth, unlawful per local ordinance in Orland Park: VILLAGE OF ORLAND PARK Ordinance No: 4889 It is unlawful to... 1. Sell, manufacture, purchase, possess or carry on their person, or in their vehicle, any bludgeon, black-jack, slung shot, sand club or sand club metal knuckles or other knuckle weapon, throwing star or any knife commonly referred to or known as a switchblade knife; Time to talk to the mayor. Thank you for posting the non-preemption concern. I would not have looked otherwise.