Comment by lazyasciiart

Reuniting within a year is not intrinsically evidence that it was a bad removal - a parent can change a lot in less than a year. Most obviously, one abusive parent can be jailed or kicked out and the children go home to live with the remaining parent, who may have been abused themselves. Rehab, counseling, parenting classes, diagnosis and treatment for mental illness, moving out of an unsafe hoarding home, etc, can all be done in that time.

The ones you want to really examine are the kids who go home in less than a week. At one point I think I read that New Mexico had about 25% of children who entered care returning home within days. Those are very likely to be children who were not at risk of harm in the first place.