Interpreting methamphetamine purity facts is complicated as it is not usually documented irrespective of whether samples are of powder or crystal methamphetamine. M?th?m?h?t?m?n? n?ur?t?x???t? ??u??? ?dv?r?? ?h?ng?? ?n br??n ?tru?tur? ?nd perform, ?u?h ?? reductions in gray m?tt?r v?lum? ?n ??v?r?l br??n r?g??n?, ?? w?ll as ?dv?r?? ?h?ng?? in m?r