The Thin White Line (Part 1).Peter wins the Griffin family a cruise after winning a company competition. Shortly before the family prepares to leave, Joe recognizes the sensitivity of Brian's nose and offers him a job detecting drugs as a police sniffer dog. At the airport, Brian uncovers a bystander carrying cocaine; however, he accidentally inhales it. The next morning, Brian has an emotional breakdown after the family stages an intervention with his psychiatrist. The family compromises on sending him to rehab with their vacation money. Peter joins Brian since he now cannot go on vacation, and the two cause unrest among their fellow patients by causing premature births in pregnant teens. After the two are caught, Peter is accused of being Brian's "x-factor"; however, Brian manages to defend him and decides to leave the center. The Griffins throw a party to celebrate Brian's return, but are shocked when he announces that he is leaving Quahog to Los Angeles to continue the search for the thrill of his life.

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