His role in the rise of the Khmer Rouge has not so far been closely examined by the court, and he has never given testimony.
At least 200 people took part in the five-day campaign, which ended Wednesday and covered four provinces.
The March 30, 1997, attack on an opposition rally killed 16 people and wounded hundreds more.
Chan Cheng is accused of helping Meas Peng flee detention after Meas Peng was accused of incitement during land protests in Kandal.
Nuon Chea is on trial for atrocity crimes alongside two other Khmer Rouge leaders, Khieu Samphan and Nuon Chea.
Cambodia is preparing to host an Asean summit later this week, but it has said the South China Sea will not be on the agenda.
An Australian newspaper reported Monday that Australian police suspect Hun To of “heroin trafficking and money laundering.”
You Bunleng said in a written response Monday the Swiss judge had “committed professional mistakes” and had resigned as a result.
Sam Rainsy told VOA's Khmer service Thursday that officials in the government of Prime Minister Hun Sen "fear a serious investigation."
Cambodia has 2.3 million hectares of land under concessions, a new report by the rights group Adhoc says.
In a 14-page memo, Kasper-Ansermet said Cambodian staff followed the instructions of his Cambodian counterpart, You Bunleng, only.
Chhouk Bandith was questioned by the provincial court last week but walked away without being held.
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