Chhum Mey, front right, 78, a survivor of the Khmer Rouge's S-21 prison during the Khmer Rouge regime, burns an incense stick at Tuol Sleng genocide museum in Phnom Penh, Cambodia, Monday, Aug. 31, 2009. Lawyers representing victims of Cambodia's murderous Khmer Rouge regime boycotted a tribunal trying its leaders after being barred Monday from questioning a defendant about his personality and state of mind. Mey said he was disappointed with the judges decision and urged the chamber explain the reason.