PA law, butterfly knives, and the 3" "rule."

[FluffMuffin]

I’m an avid balisong twirler and I’ve become so addicted to these knives that any other knife, folders and fixed blades, are too boring to use. The problem is I couldn’t find a reasonably priced butterfly with a blade length of 3" or less. The main reason for this is a short bladed balisong with long handles isn’t balanced enough to twirl and a short blade with short handles is too small to spin around your fingers. So I looked for the specific laws on blade length and I couldn’t find it. I found this, which every balisong’er who lives in PA can probably recite by heart. I found this , which states "We did not find the "butterfly" knife to be a prohibited offensive weapon." and I found this, which states "Admin Note: Pennsylvania law does not mention a specific blade length in their law."

My questions are 1- Is the blade length law just a myth? A guideline? A general rule that PA residents simply assume?
2- Are balisongs legal to carry and use for general purpose like any other knife?
3- Does the type of blade (spear point, double edge, saw back, etc.) matter since the knife itself would clearly be a curio/collector’s piece?

I guess the easiest thing to do is run a scenario. You find one of these clipped to my pocket (note the 4 1/8" blade appears to be double edged but the back is for show, unsharpened) and I provide all the printed information from those web sites to point out how and why I thought it was legal, now what do you do?
Normally I wouldn’t be this paranoid but I don’t want to loose a $100 knife and as a gun collector the last thing I want is a weapons charge.

[Joeyd6]

Not sure about PA...but posession of a butterfly knife alone in NY, any size is illegal and a misdemeanor. There is a blade length law here in NY for all knives....they must be less than 4".

[Norm357]

What about my Uzi Joey? :D

[sbrad]

What about my Uzi Joey? :D

Hell, everybody has one of those in NYC. They hand them out at the city limit signs.