The following general principles must be applied by a person when exercising a power or performing a function under this Act:
(a) involuntary detention and involuntary treatment of a person are to be used only as a last resort when less restrictive interventions are not likely to be effective or sufficient to remediate the risks presented by the person;
(b) the least restrictive interventions are to be used when a person is being treated or dealt with under this Act;
(c) any interference with the rights and dignity of a person are to be kept to the minimum necessary.