Omar Khadr, known as the ‘child soldier of Guantanamo Bay’, is accused of killing a US soldier and receiving training from al-Qaeda.
Transferred to the detention camp in Cuba in 2002, aged 15, he is to be the first detainee tried under the military commissions set up by Barack Obama, the US president.
If convicted, he could be sentenced to life in prison. But his defence lawyers are trying to prove that none of the evidence in the case can be used because it was tainted.
Monica Villamizar has this report.