"AMN Healthcare . . . is a staffing company that provides prescreened nurses and medical personnel to hospitals and other facilities. Nursefinders hired Theresa Drummond as a medical assistant. It later assigned Drummond to work at a Kaiser facility as a medical assistant. Plaintiff Sara Montague was also a medical assistant at Kaiser. At some point, Drummond and Montague had a disagreement at work regarding how rooms were to be stocked. At the end of the discussion Montague walked away. Montague did not consider the argument serious enough to report to a supervisor or anyone else. They also had a discussion regarding misplaced lab slips where Drummond raised her voice. A few weeks after that discussion, Montague left her water bottle at work. Montague later drank from her water bottle. Her tongue and throat started to burn and she vomited. Drummond admitted that she poured carbolic acid found in a Kaiser examination room into Montague's water bottle."