Mustafa al Shamiri spent most of his years at Guantánamo wrongly described as an al-Qaida trainer and facilitator, a captive of consequence, until his first parole-style hearing revealed an astonishing admission. An intelligence review “discredited” the most damning parts of his prison dossier in his 14th year of U.S. military detention. He was mistaken for someone else with a similar name. ...

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