Winterwerp v Netherlands 6301/73  ECHR 4
In the court’s opinion, except in emergency cases, the individual concerned should not be deprived of his liberty unless he has been reliably shown to be of ‘unsound mind’. The very nature of what has to be established before the competent national authority – this is, a true mental disorder – calls for objective medical expertise. Further, the mental disorder must be of a kind or degree warranting compulsory confinement. What is more, the validity of continued confinement depends upon the persistence of such a disorder.