1) at the time the household was raided for drugs (it was NOT the trailer they currently reside in - it was a previous residence) Shaniya was not present. She was sent there on a VISIT. Custody was not turned over to mom, dad did not agree to let her reside there it was a VISIT. So authorities may not even have known of Shaniya's existence as a minor child of momster at the time of the drug raid, why would they? DCF would have no reason to check on the welfare of little Shaniya as she did not live there.
2) The custody arrangement was apparently NOT one worked out by the court but was more likely a matter of SUPERMOM handing over her infant because she had no use for her and bio dad taking her and raising her with occassional visits to momster a/k/a supermom. Because the custody arrangement was outside of the system the system would then have no reason to notify bio dad of momster's behavior, the drug raid, the concerns for children in the household etc.
IMOO Dad had no idea of the sort of lifestyle mom was living, his only error was probably taking mom at her word. if he lived 3 states away and had only whatever conversations he had with momster to go on, what normal person suspects this kind of depravity can exist in a biological mother???