Massachusetts Expandable Baton Laws
(Los Angeles, CA USA)
The law you cite says "Blackjack" not baton and in the following case I've linked you will see that the court has made a ruling that establishes that expandable batons are not considered blackjacks, therefore not illegal with the commonwealth of Massachusetts. - http://www.socialaw.com/slip.htm?cid=19527&sid=120
Thank You Dan for the information. I updated some of our information to reflect what you found.