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In summary, the eight-year sentence imposed on Khadr in the United States could only have been available as a youth sentence under Canadian law, and not an adult one, had the offences been committed in Canada."
But the offences weren't committed in Canada. They were committed in a foreign country against a Canadian ally in a warzone. Khadr was a PoW, period. The US was in no way obligated to "liberate" him until their war in A-stan was over.