@Setanta,
Of course, though I'd've though you'd have known something this basic.
https://www.google.com/amp/s/www.pbs.org/newshour/amp/updates/schools-students-protesting-national-anthem
Pertinent excerpt:
Public schools can't discipline students for silent acts of political protest that don't disrupt the operations of a school, like kneeling for the anthem or refusing to say the Pledge of Allegiance, said LoMonte, of the Student Press Law Center. And educational leaders will miss out on learning opportunities if they first seek to end a protest rather than allowing students to learn from it, he said.
"The standard should never be: 'What's the worst thing we can do to kids and get away with it?'" LoMonte said in an interview. "The standard should be: 'What's the healthiest educational practice?' Schools talk such a great game about wanting to produce civically engaged students…This is something schools should be embracing as a teaching opportunity."
It's not just a good educational practice to allow silent, unobtrusive acts of student speech; it's also constitutionally mandated, LoMonte said.
While the U.S. Supreme Court has held that "the constitutional rights of students in public school are not automatically coextensive with the rights of adults in other settings," legal precedents show there are limits on schools' ability to address speech with discipline.
In the 1943 case of West Virginia State Board of Education v. Barnette, the U.S. Supreme Court ruled that a school would violate the free-speech rights of its students who were Jehovah's Witnesses if it forced them to say the Pledge of Allegiance.
"To believe that patriotism will not flourish if patriotic ceremonies are voluntary and spontaneous instead of a compulsory routine is to make an unflattering estimate of the appeal of our institutions to free minds," Justice Robert Jackson wrote in his majority opinion.
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I hope there will be some lawsuits to bring the hammer down on these holier-than-thou behavior police.