It arrests 1.5m of its citizens each year for drug offences, locking up half a million of them; tougher drug laws are the main reason why one in five black American men spend some time behind bars.

每年，它以涉毒逮捕150万人，并将其中50万投入监狱；更加严酷的法律可以解释，为什么现在每五名美国黑人中就有一人被关入监牢。

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The Centre has pioneered a number of ideas, including a self-locking bicycle and a chair with two slots at the front for hanging bags in bars and cafes.

BBC: NEWS | UK | Designs for taking on criminals