Bullet marks along with gun residue helped in the analysis of the assassination of President John F Kennedy.
What do you mean by trace elements?
A trace element is an element found in very small quantities. For the criminalist, the presence of trace elements is particularly useful because they provide markers that may establish the source of a material or at least provide additional points for comparison of two items of physical evidence.
Bullets recovered from Kennedy's brain, the wrist of Governor John Connally, and the car in which both were riding at the time of the assassination were found to have almost identical concentrations of the trace elements silver and antimony. This supports the conclusion that the bullets that struck Kennedy and Connally were fired by the same shooter.
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