Through numerous case studies
In Place of the Parent: Inside Child Protective Services describes the child welfare/juvenile court system and how "the system" changed during my 34 year career. The narrative is informative, heart-wrenching in places, heart-warming in others. It even has some light-hearted parts.
In Place of the Parent is available in print and as a E-book from Amazon, Barnes and Noble, and other booksellers. Either link will take you to the correct page.
Amazon
Barnes and Noble