Interpreting methamphetamine purity details is complicated since it just isn't usually claimed 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 function, ?u?h ?? reductions in grey m?tt?r v?lum