On remand, following a hearing at which the defendant and the government presented expert testimony, the district court determined that a mixture of 44% mannitol and 56% cocaine base would be useable. United States v. Byfield, No. 89-0322-01, 2006 U.S. Dist. LEXIS 53671, at *12 (D.D.C. August 3, 2006) (Byfield II). Consequently, the defendant's motion for a sentence reduction was denied. Byfield I II do not help Pena.