They asked two groups of experts - psychiatrists specializing in addiction and legal or police officials with special expertise - to assign scores to 20 drugs, including heroin, cocaine, ecstasy, amphetamines and LSD.

• 他们让两组专家给20种药打分，这些药包括海洛因、可卡因、摇头丸、苯异丙胺和麦角酸二乙基酰胺(LSD)，两组专家分别是专攻成瘾性的精神病学家以及在司法或警务方面有特殊专长的人。