Did the trial court err when it refused to instruct the jury that the heroin distributed by the defendant was the same heroin that caused the victims' overdoses?

QUESTIONS PRESENTED 1. Did the trial court err when it refused to instruct the jury that the heroin distributed by the defendant was the same heroin that caused the victims' overdoses in violation of this Court's precedent in Burrage v. United States? '. 2, Did the District Court err when it refused to grant Harris an evidentiary hearing in accord with 28 U.S.C. § 2255(b) as there was a contested issue of material fact that would have entitled Harris to relief? ;