Years ago I worked at a Juvenile detention center. One night we had an unscheduled admit (Unaccompanied minor in severe emotional distress.)
The girl was about 11 or 12 and weighed about 100 lbs soaking wet. I am 5' 10" and weighed 185 at the time and was the smallest person in the room.
When the cops took the handcuffs off her she went full ballistic. Took three of us to hold her down. I wish the police had been able to use a taser on her.
My son-in-law is the Director of such a facility in Georgia. He's a big guy, 6/4" and 200 lbs. He has a book full of stories like yours. He HATES those "unscheduled admits". Hates them, cause he knows odds are there will be big trouble. He also hates the admits that are outside of his facility's classification. They literally have to walk on egg shells in dealing with these kids too.
The really sad thing, is all the facilities are full. So many kids in very big trouble.