I think those that are wondering what the rest of the story is may well be on the right track. I spent 10 years in the public school systems. The first 6 working with those students who couldn't, or wouldn't, function, well in a regular setting. Those that wouldn't, bucked the system and every rule we had at every turn. Hence, them not being allowed to be alone in hallways and having me waiting outside the bathroom for them. These actions were known as behavior plans, ways to modify the unwanted behaviors to produce desirable ones.
The last four years were spent as, what my district called, Interventionist. Again, working with the students who were removed from classes for various, and sometimes, repeted, thumbing of their noses to the excepted and established rules. These students spent countless hours in my office.
There really isn't a conspiracy to "get" one student in any building. There is, however, a conspriacy to allow other students to get a quality education, with as little interuption and distraction as possible. Please understand that I am not knocking your child. But, please sit down with his teachers and the administration and talk to them. But more important, listen to them. If your child suffers from PTSS, he needs more than any school can offer. Listen to them, brainstorm ideas and follow through with all and any that you ALL come up with. If that doesn't work, then maybe those that suggest home schooling are on the right track.
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"And the day came when the risk to remain tight in a bud was more painful than the risk it took to blossom." Anais Nin