(1) If it is established that the person whose death, injury or damage is the subject of proceedings for the recovery of damages was, at the time of the act or omission that caused the death, injury or damage, intoxicated to the extent that the person's capacity to exercise due care and skill was impaired, it is to be presumed that the person was contributorily negligent unless the court is satisfied that the person's intoxication did not contribute in any way to the cause of the death, injury or damage.(2) If there is a presumption of contributory negligence, the court is to assess damages on the basis that the damages to which the person would be entitled in the absence of contributory negligence are to be reduced on account of contributory negligence by 25% or a greater or lesser percentage determined by the court to be appropriate in the circumstances of the case.(3) The onus of satisfying the court that damages ought to be reduced on account of contributory negligence by a percentage of less than 25% is on the person whose death, injury or damage is the subject of the proceedings for the recovery of damages.(4) This section does not apply in a case where the court is satisfied that the intoxication was not self-induced.(5) Subject to subsection (6) , a reference in this section to a person being "intoxicated" is a reference to a person being under the influence of alcohol or a drug (whether or not taken for a medicinal purpose and whether or not lawfully taken).(6) A person who has taken a drug for a medicinal purpose is not to be taken to be intoxicated for the purposes of this section if the person satisfies the court that he or she was not aware of the effect of the drug taken.