This sounds worse than the Chinese system. This sounds like they are moving in to take the kids before a crime is committed because of "the environment the kids are in". Unacceptable environments:
Mother is a drug user
Mother's new boyfriend is a rapist
Family members are all gang members.
They live on the wrong side of town.
They live across the rail road tracks.
A parent voted for Brexit.
They are home schooled.
A liquor store opened next door.
Family has unacceptable religious beliefs.
Some environments really are red flags and need evaluation. But who watches the watchmen?