You might have a cause of action against the foster family and/or the state. On the other hand, the statute of limitations may have run. It’s always best to consult with a good attorney to discuss the details before you act.
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If you want to have those who harmed you placed in jail, you should contact the police. If you want financial compensation for pain you endured you should seek relief through civil action. Since it has been so long since you were with these people, there may be a statute of limitations issue. However, your battle with PTSD may have prevented you from taking appropriate action prior to expiration of the statute of limitations. You should seek a consultation with a civil tort attorney and evaluate your options.
It's possible the statute of limitations was "tolled" (paused from running) because of the PTSD as someone stated already. You definitely need to contact a personal injury attorney ASAP to sort out your options. Good luck.