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Cigarette butts were classified into three categories: legal, contraband or unknown.
烟蒂被分为三类：合法的、走私的或不知名的。
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方法用Chelex-100法提取170枚烟蒂样本的DNA，进行PCR扩增及STR检验。
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The light artillery of a mugglehead is likely to include a pipe and a roach clip.
吸食大麻的瘾君子使用的器具大概包括一支烟斗和一根烟蒂拨针.
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