Legend has it that Lee Harvey Oswald fired two guns on 22 November 1963. A rifle and a pistol (used on police officer murdered around two hours later).
Police and FBI folks performed the gun residue test on Oswald upon capture.
Results? First, the standard paraffin test was negative for gunpowder residue.
Second, the FBI ran a chemical spectroscopy test on the paraffin. Negative.
Third, the FBI sent the paraffin sample to the Oak Ridge Lab for neutron activation analysis. Negative.
The odds that Oswald fire either the rifle or pistol? Zero.
If he'd fired at least one of them....residue would have been there, and sufficient to say he fired both guns (even if you couldn't prove the pistol episode).
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