It is thought it will become a trial within a trial as the men challenge the legality of the court to hear their case, and it will be littered with postponements and adjournments.

BBC: South African treason trial starts

It took months for that challenge to reach trial because of delays gathering the DNA evidence.

FORBES: Court Ruling Finally Allows Body of Late Jefferson Star To "Move On Up"

The Khmer Rouge Tribunal will soon be facing an even greater challenge - the trial of the organisation's four most senior surviving former leaders.

BBC: Tears and disbelief at Duch verdict