it depends on what field of forensics the person works in. for instance, if they worked with bullets, they could be called a forensic ballistics examiner. if they worked with guns used at crimes, they would be a forensic firearms expert. if they worked with DNA, they could be a DNA analyst.
"omnipresent"
A person whose arteries to the heart become clogged has a cholesterol.
A nonagenarian.
An orphan
A person whose emotions change from happy to sad may be experiencing mood swings or emotional instability. It could also be indicative of a mood disorder such as bipolar disorder.
lumber-jack
Someone whose favorite color is undeniably purple...
the word chucho is how we call a person whose name is Jesus.
How do u call a person who practice track and field
A person who mows the grass on a baseball field is called a groundsman.
A person who studies the field of geology and earns the degree can call himself a geologist.
It is called Forensic science or more commonly just forensics.