In case you missed it, former-HPD chemists Amanda Culbertson and Jorge Wong filed a Federal lawsuit this morning, targeting both Harris County District Attorney Pat Lykos and Assistant District Attorney Rachel Palmer.
I've briefly scanned over the petition and it is basically the allegation that Wong and Culbertson were punished and retaliated against for their roles as whistleblowers with the HPD B.A.T. Van scandals. The petition lists numerous dates and meetings that specifically involve Rachel Palmer and it covers the cancellation of the County's contract with Lone Star College.
I don't know much about Federal Civil Law, but I would imagine that things will move fairly slowly. It will be interesting to watch it develop.