They may be a danger to themselves-suicide or to others -homicide.

It may be necessary to admit such a person, compulsorily-under legal section-to hospital for treatment and care. This is a major step and has to be closely guarded against abuse for to deprive a fellow human being of his/her liberty, perhaps for long periods and force treatment upon an unwilling patient denies an essential human right.

In criminal cases a decision needs to be made if the criminal ,at the time of the deed was in full understanding of the situation and appreciated the gravity of the offence. Very roughly would he/she have still done this action at this time if a policeman had been standing beside him.

Elderly demented patients may no longer be able to manage their own affairs and it may be necessary for the state or a responsible person to take over this task-the power of attorney.