Butterfly Knives

Dec 28, 2005
RCW 9.41.250
Dangerous weapons -- Penalty.
Every person who:
(1) Manufactures, sells, or disposes of or possesses
any instrument or weapon of the kind usually known as
slung shot, sand club, or metal knuckles, or spring
blade knife, or any knife the blade of which is
automatically released by a spring mechanism or other
mechanical device, or any knife having a blade which
opens, or falls, or is ejected into position by the
force of gravity, or by an outward, downward, or
centrifugal thrust or movement;
(2) Furtively carries with intent to conceal any dagger,
dirk, pistol, or other dangerous weapon; or
(3) Uses any contrivance or device for suppressing the
noise of any firearm,
is guilty of a gross misdemeanor punishable under
chapter 9A.20 RCW.
Effective date -- 1994

So probably not.
Jan 11, 2006
Wouldn't that make every knife with those stubes illegal? They are opened with a downward thrust.
Dec 28, 2005
Seriously. Use google. Type in Massachutsetts knife laws. That's it.

b) Whoever, except as provided by law, carries on his person, or carries on his person or under his control in a vehicle, any stiletto, dagger or a device or case which enables a knife with a locking blade to be drawn at a locked position, any ballistic knife, or any knife with a detachable blade capable of being propelled by any mechanism, dirk knife, any knife having a double-edged blade, or a switch knife, or any knife having an automatic spring release device by which the blade is released from the handle, having a blade of over one and one-half inches, or a slung shot, blowgun, blackjack, metallic knuckles or knuckles of any substance which could be put to the same use with the same or similar effect as metallic knuckles, nunchaku, zoobow, also known as klackers or kung fu sticks, or any similar weapon consisting of two sticks of wood, plastic or metal connected at one end by a length of rope, chain, wire or leather, a shuriken or any similar pointed starlike object intended to injure a person when thrown, or any armband, made with leather which has metallic spikes, points or studs or any similar device made from any other substance or a cestus or similar material weighted with metal or other substance and worn on the hand, or a manrikigusari or similar length of chain having weighted ends; or whoever, when arrested upon a warrant for an alleged crime, or when arrested while committing a breach or disturbance of the public peace, is armed with or has on his person, or has on his person or under his control in a vehicle, a billy or other dangerous weapon other than those herein mentioned and those mentioned in paragraph (a), shall be punished by imprisonment for not less than two and one-half years nor more than five years in the state prison, or for not less than six months nor more than two and one-half years in a jail or house of correction, except that, if the court finds that the defendant has not been previously convicted of a felony, he may be punished by a fine of not more than fifty dollars or by imprisonment for not more than two and one-half years in a jail or house of correction.