A very sweet Lady at Church was foster parenting, because she thought she might help a kid in need. She got a girl (14) from an addicted Mom, and brought her to the farm. Got her a horse, and into school; but the girl was waiting for the other foot to fall, as it were. She had been bounced around a lot in the CPS system, and trusted no one! The Lady finially figured out how to reach her, by adopting her legally. Now, years later, the Lady is "Mom", and with Mom's support, she also has a relationship with her birth Mother. Sometimes it works, the Girl's new daughter is being taught that the Lady is Grandma!
BUT caution must be maintained with CPS; Most are scum vermin with a vested interest in taking kids! It is easier toi take kids that do Not need to be removed, and sadly there is more money in that anyway. Good parents can be soaked for child support for decades, where drug addicts die quickly (less cash available).
So treat them like the pit vipers they are; and protect your kids from them!