I don't know what state you are in, but in Pennsylvania, child welfare workers can go into homes, schools, etc., and question a child regarding allegations surrounding abuse & neglect. The reason it's not required for parents to be present is, for example, because, (especially if the parent is the "alleged perpetrator,") chances are the child won't tell the truth/be accurate in your presence. It's all part of the confidential investigation process under Child Protective Services Law. Caseworkers are also legally bound to maintain confidentiality of the reporter of allegations. My recommendation would be to anonymously call your local child welfare agency and ask the intake worker about their policy/procedures surrounding child protective services investigations.