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The Commission oversaw the selection process for potential hosts and symbionts. Host initiates must pass all required tests and have their application approved by the Commission in order to become joined. Even then the Commission remained an authority in the joined Trill's life. They continued to care for the symbionts and gave counseling for hosts; this included requiring that joined Trill performed the Zhian'tara as a means of dealing with the memories of previous hosts. Joined Trill may serve the Commission by acting as field docent to prospective hosts. (DS9: "Facets", "Playing God")
The Commission also controlled all information regarding the symbionts. Though nearly half of the population was capable of being joined, they claimed that only one Trill in a thousand was capable, thus making the rare symbionts privileges to be earned, as opposed to commodities to be purchased or fought over. This nearly became public knowledge after an attempted joining between the Dax symbiont and Joran Belar, a violent sociopath. After Joran's execution, the Commission used a chemical memory block on the symbiont to suppress the killer's personality, and erased all records of the incident from their archives. (DS9: "Equilibrium")
After an unprepared Ezri Tigan received the Dax symbiont in 2375, the Trill Evaluation Board provided her with books and counseling, but they could do little else to assist her transition into being joined. (DS9: "Shadows and Symbols")