It is up to the discretion of the general medical practitioner certifying Life Extinct at the hospital.I if he is not already aware of the circumstances surrounding the death to contact RTP and Forensic Science requesting a full autopsy to determine the actual cause of death.
This procedure here in Thailand includes an external examination of the cadaver, tissues samples of all organs, blood, urine, cerebral spinal fluid, swabs, hair, nail clippings, any any other samples deemed necessary for examination and anakysis as per International Standards.
If any of these doctors did not request an autopsy then it is a matter for the Court to decide why.
If the case is highly suspicious, as is the case in all of these cases, then the cadavers should not have been released but kept at 0 degress or frozen until the Court and Family is satisfied.
In cases of various religious customs some cadavers are released for burial only and if required by Court order they can be exhumed and examined further.