Chapter 71, section 82 of the Massachusetts General Laws
The right of students to freedom of expression in the public schools of the commonwealth shall not be abridged, provided that such right shall not cause any disruption or disorder within the school. Freedom of expression shall include without limitation, the rights and responsibilities of students, collectively and individually, a) to express their views through speech and symbols, b) to write, publish and disseminate their views, c) to assemble peaceably on school property for the purpose of expressing their opinions. Any assembly planned by students during regularly scheduled school hours shall be held only at a time and place approved in advance by the school principal or his designee.
No expression made by students in the exercise of such rights shall be deemed to be an expression of school policy and no school officials shall be held responsible in any civil or criminal action for any expression made or published by the students.