The conventional grounds for involuntary treatment are highly problematic
Substantial problems attach to both of the fundamental criteria that need to be met for involuntary treatment in conventional mental health legislation—the presence of a ‘mental disorder’ and a risk of harm to self or others. The boundaries of ‘mental disorder’ are of necessity loosely drawn, with substantial blurring at the edges and contested views about where these should lie. ‘Values’—for example, when does ‘sadness’ become a ‘depressive illness’—play a significant role in determining when a diagnosis of a ‘disorder’ is warranted. Precision in the assessment of ‘risk’ is poor, especially for those infrequent or rare harms that we are most concerned to prevent. In general psychiatric practice, the prediction of suicide or serious acts of violence to others is of severely limited value. Even with ‘state-of-the-art’ risk assessment measures, ‘false positives’ overwhelm ‘true positives’. Significant costs attach to an emphasis on risk assessment.