I always thought that teacher training included basic skills in coping with wayward children. I wasn’t aware that it was acceptable practice to call the police to handcuff a 5-year old who’s throwing a tantrum. (Note that two staff were present, including an assistant principal, and a camera was rolling.)
[And yes, I know that a teacher can easily get into trouble for simply trying to enforce discipline. But this cure is worse than the disease. Mad. All mad.]