forensic+specialist+presentation+questions+EM

__Questions about presentations__

Ballistic Experts - Does the ballistic expert examine and analyze the gun and then give it to other specialists to test or do they do all of the testing on the gun themselves? (ex: testing blood)

Forensic toxicology - When can something be tested at the crime scene (ex:in a spot test) and when does it need to be brought back to the lab?