Any person authorized by law to perform post mortem examinations shall permit, with the consent of relatives, or in the absence of such relatives, with the consent of the State department, any representative of the anatomical or pathological departments of an incorporated medical, chiropractic, or osteopathic school or college to obtain at the time of the necropsy, such material in a recent state as may be needed for scientific purposes, if the material is not required for the legal purposes of the State.