How can I launch an investigation into a corrupt government office?

[Ladylin7777]

My grandkids were returned to their unfit mother 4 months ago. The welfare worker in charge of the case was very friendly with the mother and helped her regain custody. I found facebook photos of the caseworker partying and drinking. It seems suspicious, in light of the fact that she was so friendly with the unfit parent, who is also an alcoholic. I feel like this worker was biased and perhaps intimate friends with the parent and showed inappropriate behavior as a welfare worker.