When looking for links between suspect and victim physical evidence is very beneficial.
Links such as fingerprints, bullet trajectory, clothing fibres etc. are all examples of physical evidence. There are many many different types of physical evidence which you will learn about in this course. These are usually analysed using natural sciences and interpreted by professionals. Criminalistics is an area covered by Forensic Science and is used to help I the solving of crimes where the culprit may not be obvious.
There are different types of Criminalist as there are many types of evidence.