The prosecutor has no jurisdiction over child dependency cases. Period. The prosecutor can't compel the state to take children from their homes. CPS has to make he initial decision based on statutory criteria and then a depdnency court either supports or denies their decision within a set period of time.
Divorce court (family court) is different from dependency court cases. In family court, there are sometimes confidential reports that can only be released to an attorney. Sometimes if people don't have counsel the report will be released to them. Other times they can only read it at court. That is more common if it is an emergency report, for example.
In dependency court parents can have their parental rights terminated. Thus they have strict due process rights to all information that goes into that process, including CPS reports.