Clandestine graves are of interest to forensic taphonomy because .

criminals try to hide evidence of their acts
the weather and other conditions affect them most
they are old and easily studied by use of the skeletal evidence
civil wars usually produce them

Clandestine graves are of interest to forensic taphonomy because criminals try to hide evidence of their acts.                        

Explanation:

The work of clandestine graves is to do forensic investigations. There will be many forensic investigation cases. Criminals try to escape from those investigations. So clandestine graves have many interests in investigating the forensic taphonomy. After investigating the event the witness should match the case of the incident. Using particular information the clandestine graves should investigate the incident. They have to make criminals tell the truth of the incident.