"Copycat crimes do occur," said Jeffrey Ian Ross, a criminologist at the University of Baltimore.

美国巴尔的摩大学的刑事学家杰弗里·罗斯(Jeffrey Ian Ross)说：“模仿性犯罪发生了”。

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Rob Gordon, a criminologist at Simon Fraser University, says attempts at creating an agency to curb the gangs have repeatedly failed.

西蒙菲莎大学的犯罪学家，罗布·戈登(Rob Gordon)称，创建一个专门的部门来控制这些犯罪集团的想法再三的失败了。

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Wesley Skogan, a criminologist at Northwestern University, reckons such methods are the most likely cause of the continued drop in big-city crime.

西北大学犯罪学专家Wesley Skogan认为这种做法正是大城市发罪率持续下降的最可能的原因。

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But the latest measure looks largely symbolic, says Richard Garside, a criminologist at King's College, London.

ECONOMIST: Forbidden swords

Poverty cannot be the primary reason, says Jack Levin, a criminologist at Northeastern University in Boston.

ECONOMIST: Oakland

"They would iron their clothes and pack their knapsack, " says Richards, now a criminologist at University of Wisconsin-Oshkosh.

BBC: Great escapes: The most daring prison breakouts