http://www.theguardian.com/law/2011/feb/06/george-bush-trip-to-switzerland

"What we have in Switzerland is a Pinochet opportunity," said Gavin Sullivan, lawyer for the European Centre for Constitutional and Human Rights, backing the claim together with the US-based Centre for Constitutional Rights.

"Bush enjoys no immunity from prosecution. As head of state he authorised and condoned acts of torture, and the law is clear – where a person has been responsible for torture, all states have an obligation under international law to open an investigation and prosecute." He added: "Bush will be pursued wherever he goes as a war criminal and torturer."

Legal proceedings under way in Spain accuse White House legal advisers, known as the Bush Six, of criminal wrongdoing for advising that the techniques were legal.

"Nobody – from those who administered the practices to those at the top of the chain of command – is under a shield of absolute immunity for the practices of secret detention, extraordinary rendition and torture," said Martin Scheinin, UN special rapporteur on human rights and professor of public international law at the European University Institute. "Legally this case is quite clear. Bush does not enjoy immunity as a former head of state, and he has command responsibility for the decisions that were taken."