Cameron has a bone to pick with the name of their only witness, who says Joe was laughing hysterically before he got shot, ruling out the possibility that Joe's euphoria could be a complication from the bullet wounds. "His name is Baby Shoes! How bad can he be?" House reasons. You can't argue with that logic, especially when it's presented so perfectly. Chase suggests carbon monoxide poisoning as a cause for all of the cop's symptoms, including his cough, and Cameron is quick to snap that she doubts that could happen to someone outdoors. Except that he was only outdoors for like three seconds, Cameron. Before that, he was inside his car. As House orders them to check Joe's blood for carbon monoxide, Cameron folds her arms and looks really pissed off for some reason. I guess she's still pissed about that bullet-throwing joke? I've given up trying to figure that girl out. House sends Foreman off to check the Joe's car and home for carbon monoxide leaks or anything else that might have caused his symptoms. In a rare display of interest in his patients' lives, House himself will check Joe's workplace.
Chase informs Joe, who's still laughing and having the greatest time ever while he's wheeled down the hallway, that his bloodwork showed low-level carbon monoxide poisoning. Oh, so I guess the case is closed, then. That certainly was fast! Especially since this is a two-parter! What will they do for the remaining hour and forty-five minutes? Maybe Cameron will take some more meth and be awesome again. Cameron asks Joe whether he lives near a gas supply, and Joe answers that the only one he can think of is himself after he's had a few burritos. Cameron does not appreciate his humor. Joe says he keeps a "pretty clean" home.
Cut to Foreman in a decidedly unclean home. There are pots and pans piled on the counters with leftovers on them. The fridge is disgusting. The bathroom looks surprisingly clean. Foreman takes samples of everything. He even takes a trip to Joe's balcony area.