Here's my thought: a lot of times we (general public) are subjected to interpretation of the laws by LEOs, which may or may not be entirely accurate. My quoted exampled from Idmaster show that he "quotes" the statute as "flick of a finger" but when he posts the actual statute, it clearly says "flick of a button, pressure on the handle or other MECHANICAL contrivance." That represents a big difference in the construction of the knife. Take my CRKT SF-13 for example. It CAN be opened with the flick of a finger, because it has a lever on the blade, which allows it to be opened with the flick of your finger, or upon pulling it out from your pocket, much like the "wave" feature on Emerson knives.