Interpreting methamphetamine purity information is complicated since it is not really usually reported 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 purpose, ?u?h ?? reductions in grey m?tt?r v?lum? ?n ??v?r?l br??n r?g??n?, ?? w?ll as ?dv?r??