S5·E20 The Gang Stops Drinking

Kate wears an ear piece so that Drew can talk her through an interview with a catering company. She gets the job, and serves the guys some leftovers from her first assignment. They become violently ill, and blame Kate's cooking. However, Steve forces Mimi to confess to lacing a cookie (which Drew believed was a gift from his bosses) with a drug that causes vomiting when ingested with alcohol. The gang cannot drink for two weeks until the drug passes through their systems. Drew and Kate cannot spend any time together because of their busy schedules. He asks her to move in with him, but she believes they are moving too fast. He eventually agrees, and blames his temporary lapse in judgment on the sobriety. Lewis and Oswald begin seeing a pair of recovering alcoholics. After the drug wears off, they must choose between their new girlfriends and alcohol.