If I recall correctly a JPD officer once told me my automatic knife (switch blade) is okay as long as the blade was less than 4". I can't find the exact statute.
Search for knife and concealed here.
§ 97-37-1. Deadly weapons; carrying while concealed; use or attempt to use; penalties.
(1) Except as otherwise provided in Section 45-9-101, any person who carries, concealed in whole or in part, any bowie knife, dirk knife, butcher knife, switchblade knife, metallic knuckles, blackjack, slingshot, pistol, revolver, or any rifle with a barrel of less than sixteen (16) inches in length, or any shotgun with a barrel of less than eighteen (18) inches in length, machine gun or any fully automatic firearm or deadly weapon, or any muffler or silencer for any firearm, whether or not it is accompanied by a firearm, or uses or attempts to use against another person any imitation firearm, shall upon conviction be punished as follows:
(a) By a fine of not less than One Hundred Dollars ($100.00) nor more than Five Hundred Dollars ($500.00), or by imprisonment in the county jail for not more than six (6) months, or both, in the discretion of the court, for the first conviction under this section.
(b) By a fine of not less than One Hundred Dollars ($100.00) nor more than Five Hundred Dollars ($500.00), and imprisonment in the county jail for not less than thirty (30) days nor more than six (6) months, for the second conviction under this section.
(c) By confinement in the custody of the Department of Corrections for not less than one (1) year nor more than five (5) years, for the third or subsequent conviction under this section.
(d) By confinement in the custody of the Department of Corrections for not less than one (1) year nor more than ten (10) years for any person previously convicted of any felony who is convicted under this section.
(2) It shall not be a violation of this section for any person over the age of eighteen (18) years to carry a firearm or deadly weapon concealed in whole or in part within the confines of his own home or his place of business, or any real property associated with his home or business or within any motor vehicle.
(3) It shall not be a violation of this section for any person to carry a firearm or deadly weapon concealed in whole or in part if the possessor of the weapon is then engaged in a legitimate weapon-related sports activity or is going to or returning from such activity. For purposes of this subsection, "legitimate weapon-related sports activity" means hunting, fishing, target shooting or any other legal sports activity which normally involves the use of a firearm or other weapon.
Sources: Codes, 1880, § 2985; 1892, § 1026; 1906, § 1103; Hemingway's 1917, § 829; 1930, § 853; 1942, § 2079; Laws, 1898, p. 86; Laws, 1960, ch. 242, § 1; Laws, 1962, ch. 310, § 1; Laws, 1991, ch. 609, § 4; Laws, 2007, ch. 530, § 1, eff from and after July 1, 2007.