I live in Europe and I have never heard of them too.I'm not from the States and I've never heard of these behavioral camps. It all sounds horrific and barbaric to me. Just my opinion. May the child RIP.
My mind simply boggles!!
As a teacher, I sometimes deal with such kids but we have help of a psychologist and professional counsellor at school.
Any youth camp is restrictedly checked by educational authorities and I mean just a holiday camp.
If such "behavioral"

I can assure you that staff would consist of doctors, psychiatrists, psychologists, nurses, and professional therapists on site.
Never ever I have heard of "kidnapping" or handcuffing kids

Sorry folks,
this is madness !!!!!!
JMO