Authority for removal of human organs from bodies sent for postmortem examination for medico-legal or pathological purposes

(a) for medico-legal purposes by reason of the death of such person having been caused by accident or any other un-natural cause; or (b) for pathological purposes, the person competent under this act to give authority for the removal of any human organ from such dead body may, if he has reason to believe that such human organ will not be required for the purpose for which such body has been sent for postmortem examination, authorise the removal, for therapeutic purposes, of that human organ of the deceased person provided that he is satisfied that the deceased person had not expressed, before his death, any objection to any of his human organs being used, for therapeutic purposes after his death or, where he had granted an authority for the use of any of his human organs for therapeutic purposes after his death, such authority had not been revoked by him before his death.