Mealey's (October 12, 2020, 1:42 PM EDT) -- ATLANTA — A medical expert’s opinion at trial for a Florida doctor convicted of illegal sales of opioids that the doctor overprescribed controlled substances is sufficiently reliable, the 11th Circuit U.S. Court of Appeals ruled Oct. 9 in affirming the doctor’s conviction and sentence in all respects (United States v. John Matthew Gayden, Jr., No. 18-14182, 11th Cir., 2020 U.S. App. LEXIS 32030)....