Well, I lived through that personally. There was a court hearing where they appointed a legal representative (an attorney) and a public defender, and then they argued about it for several hours during multiple hearings. The representative was checking on me, my conditions at the hospital and my treatment frequently and reported it to the court. As soon as they all deemed me to be back in my own head, they gave me my rights back.

I hated that they took my agency back then, but looking back it was fair and all of the people involved tried their best to represent my interests, and I'm grateful they did it.