Stardate 51367.2: Some members of Voyager's crew spend time on the Mari homeworld. The Mari are a telepathic species and seem to have left behind their former aggressions. Crime practically doesn't exist, as Chief Examiner Nimira tells Tuvok. While negotiating on a Mari market with a man named Guill, another Mari bumps into B'Elanna. She is annoyed for a split second but recognizes that it must have been by accident. A bit later, the away team witness a violent attack on the market. The attacker is named Frane. He is the one who bumped into B'Elanna. Nimira surprisingly arrests B'Elanna for transferring her aggressive thoughts to Frane and sentences her to an engrammatic purge. Janeway and Tuvok have one day to find exonerating evidence. They discover that Frane was involved in previous offenses involving violent thoughts but was released as cured each time, which under Mari laws does not ease B'Elanna's guilt. On the Mari market, an old woman kills Talli, the woman Neelix was going to date, for no apparent reason. Nimira asks for Tuvok's help in the investigation of the homicide. Tuvok mind-melds with B'Elanna, and he becomes aware of a new suspect: Guill. He may have probed B'Elanna's mind to obtain her thoughts. Tuvok follows Guill and finds a black market for violent emotions. He agrees to sharing his thoughts with Guill and overwhelms the man with his mental powers. In light of the new evidence that she was probed against her will, Nimira agrees to stop the engrammatic purge on B'Elanna that has already started.

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