(September 16, 2016, 10:44 AM EDT) -- TUCSON, Ariz. — The State of Arizona has not proven beyond a reasonable doubt that a jury would have convicted a defendant of second-degree murder even had it heard expert testimony criticizing the methods used by firearms examiners to match a gun to a crime, an Arizona appeals panel majority held Sept. 13, reversing the conviction (The State of Arizona v. Joseph Javier Romero, No. 2 CA-CR 2012-0378, Ariz. App., Div. 2; 2016 Ariz. App. LEXIS 217)....