299.—(1) Subsection (2) applies where for any purpose of this Act a determination falls to be made of whether doing a particular thing, or failure to do a particular thing, in relation to a person would create a risk, or any particular level of risk, of serious physical harm to other persons.
(2) In determining that question, regard may be had only to evidence—
(a)that the person has behaved violently towards other persons; or
(b)that the person has behaved himself or herself in such a way that other persons were placed in reasonable fear of serious physical harm to themselves.