Kershaw "Ken Onion" series knives utilize the "Speed Safe" system which incorporates a "tortion bar" that acts as a spring to assist opening. Kershaw is advertising that these are not switch blades and they are widely available in retail stores (so I'm told). At least one Michigan District Court Judge from Oakland County has ruled they are not switch blades. At least one Michigan District Court Judge from Ottawa County has ruled that the are switch blades. (BTW dude used it to slice up a bunch of car tires). I'm not here to give legal advice, or participate in an argument about whether they should be legal or not (you guys can do that if you want), just to say be careful! Edit: Here is what the statute says, it is a 1 year misdemeanor: § 750.226a. Pocket knife opened by mechanical device; unlawful sale or possession; persons exempted. Sec. 226a. Any person who shall sell or offer to sell, or any person who shall have in his possession any knife having the appearance of a pocket knife, the blade or blades of which can be opened by the flick of a button, pressure on a handle or other mechanical contrivance shall be guilty of a misdemeanor, punishable by imprisonment in the county jail for not to exceed 1 year or by a fine of not to exceed $300.00, or both.The provisions of this section shall not apply to any one-armed person carrying a knife on his person in connection with his living requirements.