Are there similar services for people who won't or can't get clean? I have a vague memory that there was a court decision stating that someone cannot be forcib

Are there similar services for people who won't or can't get clean? I have a vague memory that there was a court decision stating that someone cannot be forcibly made un-homeless unless they're a danger to themselves or others. I'm sure there are some IANALs here who can clarify my murky memory.