The Norwegian lawyer Sverre Kvilhaug has written an important book where he summarizes international research on the effects of separating children from their parents. The results are not to be misunderstood: except from the worst cases, placing children in foster homes have more severe effects on the children than being raised by "bad parents".
Fampo has published a short review of Kvilhaug's book here: http://www.fampo.no/cps-and-research.html. Kvilhaug's book is in Norwegian. Does anyone know literature on this topic in English? It has got the potential to create opinions on the CPS.