 Back at Princeton-Plainsboro Hospital, Foreman shows House the inconsistencies involving Casey, and House suggests her symptoms fit either because she has polio, or because she actually had heat stroke, but someone poisoned her with thallium.The fault lies on Brennan, who admits to the scam, saying it was necessary to prove the vitamin C treatment was reliable.House does not fire Brennan because he did what he believed, but he tells him to quit instead, stating he is ethically insane, while notifying Foreman to call the authorities.