KUWAIT CITY -- After arriving here from Guantanamo Bay in November 2005, Abdallah Saleh al-Ajmi was transported by Kuwaiti security agents to a military hospital, where he was allowed to meet with his family. He was soon moved to the city's central jail and placed in a high-security wing.

Every few days, he was taken to a small interrogation room, this time by officials of his own government who wanted to know what he had been doing in Afghanistan. Ajmi insisted that he never traveled to Afghanistan, that he never fought with the Taliban -- that he had simply gone to Pakistan to study the Koran and that he was apprehended when he traveled toward the Afghan border to help refugees. He kept trying to steer the sessions toward a discussion of his nearly four years at Guantanamo and what had happened to him there.

After four months, a judge ordered him freed on $1,720 bail. He was later tried in a criminal court and acquitted of all charges.

Senior U.S. government officials were deeply disappointed -- they had hoped that Kuwait, an American ally, would find a way to detain Ajmi for years -- but they refrained from any public criticism. At the very least, the officials figured, Kuwaiti authorities would keep a close watch on him. And they expected Ajmi to move on, to put his Guantanamo experience behind him, to get a job and settle down after his time in one of the toughest prisons on the planet.

Ajmi chose a different path. Last March, he drove a truck packed with explosives onto an Iraqi army base outside Mosul, killing 13 Iraqi soldiers and himself. It was the denouement of a nihilistic descent that his lawyers and family believe commenced at Guantanamo.