NO physical evidence can indicate actual guilt or innocence. But, the trier of fact must put that into the context of a case to decide if the person is guilty or not guilty. Again, DNA, or for that matter any physical evidence, provide one piece of information about a crime. Criminalistics is the examination of physical evidence, and is not associated with pathology, which examines the body itself. Forensic in front of any other discipline means the application of that discipline to a legal proceeding.
Forensic science is the application of science to some court proceeding.
There is so much work to do in a crime lab with so few people, that usually only rapes and murders get worked. It's just that we are too strapped for resources to do anything other than the most serious crimes. It took almost 25 years for fingerprints to be accepted as evidence in courts. It just wasn't believed. As a private consultant, yes, I am an equal opportunity analyst.