How is metal, paint and soil evidence collected? Where is it typically found? What testing methods are used to test metals, paint and soil? Refer to the portion of the text which deals with the evidence from the President Kennedy Assassination. Explain how the analysis of trace elements was important to the investigation of the assassination of President John F. Kennedy. List the method that was used to analyze these bullets and the science behind this method of discovery which can distinguish between trace elements in bullets.