MobBoss
Off-Topic Overlord
English language comprehension should have kept that law off the books, so it's a little late to hope for it now.
A knife with an automatic spring or other device for closing the blade is not only not "commonly known as" a switchblade knife, it is flat out not a switchblade knife, so English comprehension tells us the law makes no sense in the first place.
Then we go to previous case law regarding the issue. Is there a history of charging spring assisted folding blade knives? Has the 'commonly known as switch-blade' language been an effective defense in the past? It's hardly likely that this is the first time this has come up.
Also, the problem with the 'commonly known as' is that definition is rather subjective. A switchblade to some people is a knife that produces a blade straight out of the hilt when a button is pushed, but a folding blade can also be considered switchblade if it is of the type that the blade swings out unassisted if a button is pushed. It is of the latter type that the knife in question might be.
In doing a google search for 'switchblade' this is what comes up. From the images seen it is very common for a knife with a folding blade that is released with a button to be called a 'switchblade' (and in fact the majority of switchblade type knives are exactly that)...which is why the prosecutor in this could very well be wrong.
https://www.google.com/search?q=swi...a=X&ei=68BMVZalGNKryATPtYG4Bg&ved=0CAcQ_AUoAg