I'm wondering the the A.G. Russell "Funny Folder" could be considered a gravity knife or other illegal items. For those of you unfamiliar with the design, here's a YouTube video... http://www.youtube.com/watch?v=-yO_KnSnglg
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I also have one, and I would also concur. As the video reviewer points out you can open it one-handed, but it's a feat of prestidigitation to do so and quite slow and clumsy. You can't flip it out fast in an intimidating fashion. Most legal problems with knives has to do with being "scary" and this isn't at all.