What about those people or their relatives who will evade going to hospital because of the fear that they will be detained longer than really necessary?
Sounds like there needs to be a re-think of this matter. A person can leave hospital after a week having had a major heart operation and yet someone who has sought help for a problem with his/her mind has to be treated like a criminal.
Admitedly there would be some people who would be a danger to themselves and others but what about those who are not that extreme?

There could be abuse and therefore there should be some safeguard and way to deal with this without holding people for a month as such.