Nuon Chea and Khieu Samphan committed genocide against ethnic Vietnamese, a judge rules.
Reasoned judgments allow parties to prepare for higher appeals and promote transparency, CCHR says.
The group says land marked for their relocation lacks the infrastructure to support them.
Only those legally in the country will be resettled, with the rest sent back to Vietnam, a government spokesman says.
The groups highlight a dispute in Preah Vihear province connected to a government land concession.
Hun Sen’s bet that Kem Sokha won’t be freed suggests the opposition chief’s case is already decided.
Rhona Smith also calls for an end to pre-trial detention at the end of her sixth visit to Cambodia.
But former CNRP leader Sam Rainsy says the move will come in December in response to international pressure.
After trying to petition at cabinet offices and government ministries, they are turned away by police.
Meanwhile, villagers attempting to present petitions in land-dispute cases are held and questioned by police.
At least 13 reporters have been murdered in the country since 1994, with nearly no convictions.
Rights group says juveniles, pregnant mothers, babies especially at risk in harsh living conditions.