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F 18.79 n1 Definition Of Switchblade Knife (PC 653k).
Prior to amendment, PC 653k excluded knives that are designed to open with one hand utilizing thumb pressure applied solely to the blade of the knife or to a thumb stud attached to the blade. Effective January 1, 2002, the definition has been amended to provide this exclusion only if the knife has a detent or other mechanism that provides resistance that must be overcome in opening the blade, or that biases the blade back toward the closed position. (Stats. 2001, Ch. 128 (SB 274).)