Hello
I work for community mental health team and on various psychiatric units (in UK),
if somebody is considered to be a risk to themselves or to other people then they can be detained under the Mental Health Act (1983). This is commonly known among patients as a section, common detention sections are section 2 and section 3. People are placed under section if they are considered danger to themselves or other people.
If somebody is under a section (of the MHA1983) then other professionals may restrain them under certain circumstances. If a patient is violent towards staff, professionals, other patients or any body else that they come into contact with then restraint by a trained professional is deemed as necessary. The level of restraint must be proportionate to the risk of threat to the professional charged with control and restraint. on psychiatric units they have what is known as PET, this stands for Psychiatric Emergency Team, this team is made up of control and restraint trained staff. the PET repsond to incidences of violence or danger presented by patients.
Besides control and restraint there are also restrictions that can be placed on a patients liberty. It may be that they have to stay in hospital. If they leave they will be brought back by police. A person under the section must comply with medication as prescribed by a psychiatrist, failure to comply with medication can reusult in consequences such as further loss of liberty in attmepts to coerce complience with medication.