(a) No postmortem examination of the body of a deceased person shall be conducted by any person other than a duly licensed doctor of medicine or osteopathy. Written or telegraphic consent for a doctor of medicine or osteopathy to conduct a postmortem examination of the body of the deceased person shall be deemed sufficient when given by whichever 1 of the following assumes custody of the body for the purpose of burial:
(b) The licensed physician conducting the postmortem examination shall not be liable in damages for any action taken in making such postmortem examination.