Can a teacher physically grab a student by the arm?

Question Details: My 8 year old son came home from school and said that during his lunch time, he and a friend were discussing a car accident in which a young lady had passed away. My son asked if the lady had blond hair. The friend, as it turned out, was a cousin of the lady who passed and our cousin was the one who found her. He was about to give his condolences when the lunchroom teacher came over and grabbed him by the arm and dragged him to the side of the room and yelled at him, making him cry. Is it legal for them to do that and what if anything should we do about it? We have already contacted the school to no avail.

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