Our expert says:
Maybe this isn't the answer you're looking for, but I don't think that "staging an intervention" is what a good teacher should be doing. And trying to do so in an uncontrollable setting like in front of the class, could have disasterous results. Especially with a troubled teen, it needs expert skills in assessment and diagnosis, and then in pychotherapy, to have much chance of success.
A ood teacher is very valuable in recognizing a troubled child and referring them to a suitable expert. Encourage the parents to take the child to see a child psychologist or child psychiatrist, for a proper assessment and expert advice.
If you try to become involved in a therapeutic way, you are not only likely to fail at that, but could spoil what sounds like a very helpful educational role that may be especially important in this child's situation.
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