Khmer Rouge tribunal prosecutors say enough evidence exists for the court to consider a legal principle known as “joint criminal enterprise,” which allows for defendants to be investigated for collaborative crimes.

The case of Duch, former Khmer Rouge prison chief, suggests enough evidence to pursue “JCE,” prosecutors wrote in a proposal to the court posted on the tribunal Web site Wednesday.

Unlawful arrests, torture and killings under Duch, whose real name is Kaing Kek Iev, appeared to be systematic, the prosecutors said.

Tribunal spokesman Reach Sambath said Trial Chamber judges had received the motion and were taking it under consideration.