Not every knife is a "deadly weapon." Many knives would be considered "capable of inflicting death." But if the knife is not specifically adapted for use as a weapon OR is not possessed, carried, or used as a weapon, then the knife is not a "deadly weapon" in Ohio.
Here are some cites for cases discussing knives and whether or not they are deadly weapons: 2006-Ohio-2783, 2006-Ohio-833, 2003-Ohio-6248, and 2003-Ohio-2195.
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