Looks like Nikki's story checks out, because she's now chatting with Elliot over coffee back at the squad room, telling him she's been undercover at Hudson since the fall as part of a big operation, since there have been three ODs there recently. Elliot can't believe Nikki targeted Kathleen knowing Elliot was a cop, but Nikki says they weren't targeting Nikki, because she's not dealing, just getting high. A lot. She suggests getting Kathleen into rehab, and she'll be back to straight As next semester. Yes, it's just that easy! Elliot makes a face.

One snag though, which we find out from Kathy, who's just shown up at the precinct, all upset: Kathleen's disappeared. Nikki says there's an abandoned Laundromat on Second and A where Hudson students go to get high.

Sure enough, when Elliot and Fin arrive, they find Kathleen unconscious, in her underwear, under some guy, also passed out. They slam Buddy against the wall, much to his chagrin, but Elliot can't rouse his daughter: she's ODed, and Elliot hoists her onto his shoulders and carries her out.

What's wrong with you people? I can't watch this! I can't! Oh, God. Elliot watches medical staff at St. Mark's induce vomiting in his daughter, at least until a nurse comes along and closes the blinds.

Later the doctor tells Elliot and Kathy that Kathleen's very sick (wow, no wonder they pay him the big bucks), and that they think she's self-medicating to deal with bipolar disorder. "My daughter's not crazy," says Elliot, being his usual helpful self. The doctor figures she'll have a normal life if they get her on lithium, and Elliot bolts, telling Kathy he needs some air.

He also needs to punch a parking sign, apparently, denting it. That's where Olivia and Cragen find him to tell him that the Fosters have filed a complaint against Kathleen because they're missing an expensive diamond pendant. Olivia points out that Kathleen was wearing a pendant when they picked her up. Elliot quickly says it's cubic zirconium and was a gift from him, and the Fosters are probably trying to pull an insurance scam. Olivia looks like she's not sure she believes Elliot. Well, why wouldn't she? She doesn't think Elliot would ever behave irrationally where his family is concerned, would he?

It's over to ADA Kim's office, who must be enjoying the fact that Elliot is forced to be nice to her instead of his regular hard-ass self. She tells him the necklace was worth a lot of money, so Kathleen's facing larceny and burglary charges. Elliot offers to go talk to the Fosters, which Kim outright laughs at, especially when Elliot claims he'd do the same for any kid. Kim asks him how many "junkie thieves" he's let slide recently, and it's awfully nice of her to refer to a colleague's daughter that way. She advises him to get a lawyer, and he tells her he's not letting Kathleen go to Rikers, because the doctor says she's mentally ill. Kim says they won't arrest Kathleen if she's in a mental facility.