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Physical Evidence
Magazine inside the gun and its fingerprints
Clarke attributed fingerprints on the magazine inside the gun to Tamerlan Tsarnaev and contrasted them with Dzhokhar's fingerprints on a BB gun.
About
Clarke cited the magazine fingerprints in arguing that Tamerlan, rather than Dzhokhar, used the firearm in the shootings; this was a defense argument, not a new factual finding.