Administrative law is concerned with what government aganecies must, can, or must not do. If you think they've abused their authority, incluuding by violating your Constitutional rights, you can have judicial review of their actions or inaction, which is what the current proceedings are about. Here, what the agency can do is impacted by whether the kids may be exposed to harm, including crime. Evidence of past or ongoing crime is relevant, but not central to the proceedings. Punishmnet for past crimes will be a separate matter altogether, involving a host of other lawyers.