Here is the site I used to gather the info:
I couldn't find anything on blade length.
30-7-1. "Carrying a deadly weapon."
"Carrying a deadly weapon" means being armed with a deadly weapon by having it on the person, or in close proximity thereto, so that the weapon is readily accessible for use.
History: 1953 Comp., § 40A-7-1, enacted by Laws 1963, ch. 303, § 7-1
30-7-8. Unlawful possession of switchblades.
Unlawful possession of switchblades consists of any person, either manufacturing, causing to be manufactured, possessing, displaying, offering, selling, lending, giving away or purchasing any knife which has a blade which opens automatically by hand pressure applied to a button, spring or other device in the handle of the knife, or any knife having a blade which opens or falls or is ejected into position by the force of gravity or by any outward or centrifugal thrust or movement.
Whoever commits unlawful possession of switchblades is guilty of a petty misdemeanor.
History: 1953 Comp., § 40A-7-7, enacted by Laws 1963, ch. 303, § 7-7