This whole issue is sticky and a little scary. I try to comply with the law. It's hard, because first, the laws are hard to find; second, individual towns may have different regulations and moving from one jurisdiction to another is extremely complicated; third knife laws seem to be either intentionally vague or extremely dated. (example - the prevalence of anti "dirk" language. Also, the "gravity knife" laws. Back in the good old days when knives were hard to open, this may have been relevant. But with modern materials, especially washers, just about the only blades that won't flick open are sheath knives.) I think the laws may be intentionally vague so that if you get caught doing something bad, they can stretch the law to fit. That doesn't make me any happier about the off chance that I'm doing nothing wrong but happen to arouse someone's suspicion or malice.
I've thought about blade length in some detail, since I currently live in an environment (Boston) with a length-limit written into the law. If I buy a blade that's spot-on according to the manufacturer's spec, but someone decides to measure a little differently, I may very well be guilty of a felony. I'm particularly worried about curved blades like the Harpy or Dodo - would the DA decide to measure along the cutting edge instead of tip to handle? Can I afford a high-power enough lawyer to convince the jury that said DA is a moron?
The scary part comes in the penalty. A felony conviction strips away lots of rights and comforts that most people take for granted. A felony knife conviction perhaps moreso, because most people equate knives with weapons, violence, etc. Better than putting length measurements on blades, we need to educate the public, portray ourselves as upstanding citizens and knife use as normal.
Although, when we print the length, we might as well include a few other warnings, like "Not for use as a backscratcher" or "POINT EDGE THIS WAY" or "The surgeon general has linked knife use with psychotic behavior. This blade will turn you into a raving, bloodthirsty maniac." :footinmou
