Martha and Taub meet up with Foreman and Chase to inform them that Brian made it through the psych evaluation with no apparent mental issues and the fungal infection diagnosis seems to be wrong, as Brian is getting worse despite the treatment. Chase sighs that it's going to be difficult to figure out what in Brian's home is making him sick since there's so much stuff, but Taub says they can rule toxic exposure out at this point since Brian has been out of his home for days and he's still getting worse. Foreman wonders if being out of that house is actually hurting Brian instead of helping him; saying that if he was using a portable gas heater to heat his house and it was leaking carbon monoxide, then that would have somehow improved Brian's lung function and thus kept his lung symptoms from worsening. The Cottages like this diagnosis because if it's right, then they'll be able to cure Brian quickly and still get two days off. But it also means a trip back to Brian's house to test for carbon monoxide to prove it. Martha happily volunteers herself and Chase, saying that it's only fair since Taub and Foreman went last time.
Hadley takes a turn driving. House stares out the window in silence, apparently preferring not to talk to a murderer. Hadley asks if they can "give this whole thing a rest" since she's had a "pretty rough year." Yeah, I'm sure he's going to drop it now that he knows you murdered someone, Hadley. He won't have any follow-up questions at all. Of course, he asks her how she killed that guy. From the excessive prescribing charge, he guesses that she was driving under the influence, hit someone, and took off. The guy with the freshly-crushed testicles saw her do it and turned her in. Yeah, that makes a lot of sense. They put her in jail for just six months for "excessive prescribing" because she got drunk, ran over a guy, and drove away. Not for vehicular manslaughter, DUI, or leaving the scene of an accident.
Foreman spots Ruby, that hot young new nursing assistant Taub hooked up with. He asks her a few questions about how she likes her new job before letting on that he knows about her and Taub. She's clearly not thrilled to know that Taub has been talking about her to both of their co-workers, but that's why you shouldn't sleep with someone you work with in the first place. Especially when you're new and barely know him. Now all the doctors will be expecting her to sleep with them. Foreman then tries to ask her how Taub managed to hook up with her, but she gets all freaked out and asks if Foreman is trying to tell her something abut Taub she should know. So now she thinks that Taub has herpes or something and Foreman probably ruined Taub's future chances with her. He tries to repair the damage but can't think of anything to say that won't make things worse, so he goes with wishing them a good time on their date tonight. Ruby says they actually don't have a date tonight -- Taub cancelled on her.