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The Obama administration has said it intends to try several of the prisoners now detained at Guantanamo Bay in civilian courts in this country. This would include Khalid Sheikh Mohammed, the mastermind of the Sept. 11, 2001 terrorist attacks, and other detainees allegedly involved. The Justice Department claims that our courts are well suited to the task.

Based on my experience trying such cases, and what I saw as attorney general, they aren't. That is not to say that civilian courts cannot ever handle terrorist prosecutions, but rather that their role in a war on terror—to use an unfashionably harsh phrase—should be, as the term "war" would suggest, a supporting and not a principal role.

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The challenges of a terrorism trial are...