In order to implement this article, coroners are authorized to disinter any body already buried and, like a sheriff, to command the power of the county for that purpose. Medical examiners, other than local medical examiners, may likewise exercise such authority in any case wherein such authority is granted by an order of the judge of the superior court of the county. Such orders may be granted by judges of the superior courts, in their discretion, upon petition of any medical examiner other than a local medical examiner.