(1) If any part of a defence is based on actual knowledge or belief, evidence of intoxication may be considered in deciding whether the knowledge or belief exists.
(2) However, if—
(a) each physical element of an offence has a fault element of basic intent; and
(b) any part of a defence is based on actual knowledge or belief;
evidence of self-induced intoxication cannot be considered in deciding whether the knowledge or belief exists.
(3) If any part of a defence is based on reasonable belief, in deciding whether the reasonable belief exists, regard must be had to the standard of a reasonable person who is not intoxicated.
(4) If a person's intoxication is not self-induced, in deciding whether any part of a defence based on reasonable belief exists, regard must be had to the standard of a reasonable person intoxicated to the same extent as the person concerned.