Yuri works for a county law enforcement agency. he assists the sheriff's department by finding out the cause of death in homicides, suicides, and other cases of unnatural deaths. he is required to perform autopsies in such cases. based on this information, yuri is a

I believe the answer is: Coroner 
Coroner has the permission to get into crime scene, conducted several experiments on laboratory, and identify the full detail of victim's death.
The data that produced by Coroner would be used by justice department to catch and put the perpetrators into trial.

Absolute !