I have read through this thread and others and I understand that:
1. MA law forbids that a gun be "on one's person" while on school grounds.
2. Police officers may interpret (correctly or incorrectly; there is no case law) that "on one's person" may be in the car they are traveling in or have parked.
3. GOAL and others recommend that regardless of storage, etc., it isn't a good idea to bring a gun on school grounds.
What I would like to add to this old thread is this: The Commonwealth of Massachusetts itself may interpret this language in the most stringent form. On this web page (
http://www.sec.state.ma.us/cis/ciswel/weltomas.htm), which is entitled "Welcome to Massachusetts," in the section on gun laws, they state:
"No one may possess, transport or store any type of gun in a building or on the grounds of any school without prior authorization by the board in charge of the school."
It appears that someone in the Office of the Secretary of State felt that the language needed clarification, and they did.