If a person enters a alcohal detox center volunterily can they volunterily sign themselves out?

A person can be involuntarily commtted to a facility if the crisis center thinks they are a danger to themselves or to others.  They can be committed for a period of 72 hours, then a hearing is held to determine if they are to stay longer and can be released.  If they have voluntarily signed themselves in, and then continue to be in crisis, the facility may not allow them to sign themselves out and may try to keep them for the 72 hours.