It’s a reality that faces some 800,000 American children a year: their home environment is no longer safe or appropriate for their own well-being. A child welfare caseworker gets called in to see if the reports of abuse or neglect are legitimate. A therapist and pediatrician enter the picture to examine the child. If there is sufficient reason for concern regarding the health and/or safety of the child, a court will rule that the child be temporarily removed from the home.

https://www.healthychildren.org/English/family-life/family-dynamics/adoption-and-foster-care/Pages/Foster-Parenting.aspx