In 2369, after the assassination of the Prime Minister, the government of Tilonus IV collapsed into anarchy. The remnants of the government splintered into factions that were vying for control and were desperately looking for technology or weapons that would aid them in their cause. Some factions resorted to torture for information. Fearing for their safety, the research team on the planet went into hiding.
Aboard the USS Enterprise-D, Captain Jean-Luc Picard ordered Commander William T. Riker to locate and rescue the research team there. He was captured by one of the factions and subjected to a neurosomatic technique used by Suna in an attempt at extracting strategic information from him. (TNG: "Frame of Mind")