Cambodia has about 530 garment factories, employing more than 370,000 workers.
About 40 Cambodian police and military police received FBI training in interview techniques this week.
The court has come under increased pressure in recent weeks to move forward on cases 003 and 004.
Last year, the Cambodian authorities were granted royal pardons for 182 prisoners.
More than 400 personnel will take part in training exercises that begin Wednesday in Kampong Speu province and run through May 27.
International prosecutor Andrew Cayley expected to see no more than 10 people on trial.
Reach Sambath fell in his office on Tuesday, suffering an apparent stroke from high blood pressure.
The BBC World Service Trust surveys 2,401 Cambodians from all walks of life.
About 60 million people depend on the Mekong directly or indirectly for their livelihoods.
About half the respondents—52 percent—said low salaries were causing a decline in education quality.
Survivors were invited to draw what they could remember of the Khmer Rouge, from torture to lost family members.
The proposed March comes as workers face increasing pressure from food and fuel prices, while salaries remain low.
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