Former leaders Noun Chea, Khieu Samphan, Ieng Sary and Ieng Thirith have all denied atrocity charges.
Thet Sambath spent more than a decade in extensive interviews with Nuon Chea before his arrest and detention at the UN-backed tribunal.
In 2010, the government interceded in 160 cases of human trafficking, smuggling or labor exploitation, according to official figures.
The Khmer Rouge Tribunal is caught up in a spat between its investigating judges and international prosecutor over case 003.
About 60 percent of government employees earn between $65 and $100 per month.
Cambodia is preparing to host a youth summit for the regional body in 2012.
Under the Khmer Rouge, Muslims were forced to break major tenets of their religion, including eating pork and frequent prayer.
About 250,000 women were forced to marry against their wills by the Khmer Rouge, according to the film producers.
Loun Savath, who has since fled Phnom Penh, told VOA Khmer by phone his actions had not gone against the will of Buddha.
“Extraordinary Chambers” is showing at the Geffen Playhouse in Los Angeles through July 3.
The main purpose of the visit (his fifth) was to assess how well parliament functions in upholding the rights of ordinary Cambodians.
The rights group Adhoc has so far recorded at least 124 arrests in land disputes this year, with at least 18 people now in detention.
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