The Court of in Williams v. U.S., decided on June 27, 2019, reiterated the legal standard for admissibility and reliability of the ballistic scientific evidence. Williams was convicted of felony murder and one of key pieces of evidence against him was a testimony of the ballistic expert who had matched the toolmarks of a weapon found in the defendant’s home against the bullet shells found at the crime scene.  The expert at trial had testified with certainty that the ballistic imaging was a 100 percent match. The Court of Appeals held that there was a lack of scientific data to
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