Is Sirhan Sirhan really guilty of assassinating RFK?
Some 40 years after the shooting of Democrat Robert F. Kennedy, new evidence has surfaced which suggests that the man serving a life sentence for his murder may not have fired the shots that killed the charismatic senator.
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Forensic ballistics is concerned with analysing bullets and firearms that have been used in crimes. Whilst it is not always possible to offer a 100% guarantee that a bullet came from a specific gun, it is relatively easy to identify the manufacturer if nothing else.
 
Rifling 
Identification of a bullet became possible with the advent of rifling as far [...]