Some interventions are emergencies and the child may be taken from school to a foster home, rather than being allowed to return home.
My dad was a teacher and I don't remember how many times he called the department of children's services to report suspected abuse of a child. If it was a girl, he would usually get one of the female teachers to talk to her. I remember one very sad case where the child was not bathing and my dad got one of the teachers to talk to her. It turned out the mother's boyfriend had been sexually abusing her and she stopped bathing to try to keep him from touching her.
In that case, a social worker picked the student up after school and immediately put her in foster care. I remember the mother coming to the school and calling my dad every name in the book, but he didn't care. He was too appalled at the situation.
The boyfriend was arrested and the mother was also charged as an accessory. She had about five children, and all were placed in foster care. Tragic case.