Question: are butterfly knives illegal in ny state?
Answer: Zuniga, 303 A.D.2d 773 (2nd Dept. 2003). However, do not think that because it is not a per se weapon possessing a “butterfly knife” may never be criminal. In fact, the possession of any knife with a blade size equal to or exceeding four inches is a violation of the New York City Administrative Code (10-133).