I am probably in the minority of the customers who buy knives after knowing exactly my local county laws. I don't fudge a millimeter because frankly I like using knives that are not conventional like hawkbills or serrated blades which might be construed as "aggressive" by my local LEO's.
It seems that most counties have, "____ inches and under," wording which typically follows half-inch increments. Occasionally you will see, "ordinary pen-knife," in the states. The most common I have seen are "2 inches and under, "3 inches and under," "3.5 inches and under," "4 inches and under."
My question is: Why the partial steps like 3 and 5/8ths?
I can imagine designing a knife is very difficult, especially one that has to fold within a handle. However, I personally have no desire to buy anything deemed "illegal" and would rather max out a certain county's law so I have various knives to carry depending where I go. I know which knives I can take to Everett and which to Seattle and try to buy a decent selection of various lengths.
As I mentioned, perhaps more paranoid than most, but I have no intent to hire a lawyer to try and clear my record of a weapons charge. It might influence my future goals of working at a liquor store or running for senate. :D
Please note I'm not saying I always want to pack the maximum legal blade on me. I carry a cricket and ladybug constantly and often feel in the Calypso Jr. or Delica mindset when I could carry a Stretch.
I just hate having to put a giant "X" on one of your folding products in the catalog because of civilian responsibility. Especially when that product is damned awesome and unique like a Shabaria or possibly a Massad Ayoob sprint.
A little part of me dies when I see that 1/8th addition listed in the product specs.