Hadley digs a few fingers into Darrien's wound to feel her internal organs and make sure they weren't hit by the knife that pierced Darrien's right side. Hadley reports that everything is fine except for Darrien's liver, which was nicked but seems to have clotted over. Then, as the camera waves around the scene annoyingly (seriously, it was in rare form this week. I thought this show had finally gotten over the way-too-artsy, distracting direction), Hadley checks Darrien for internal bleeding. She doesn't find any signs of it... yet.

And over at Foreman's apartment, Foreman comes home from the gym to find Taub and the woman he sleeps with when he isn't with his ex-wife, Ruby, in the middle of a seemingly serious conversation. Ruby jumps up and leaves to go to work. Foreman asks Taub if they just broke up or something. Taub says it's much worse than that: Ruby is pregnant. Oops!

Darrien tells Hadley and us how she wound up getting stabbed. The police raided her boyfriend/dealer/pimp/whatever's place, so he stabbed her "to slow the cops down." That doesn't even make sense. Also, way to get an attempted murder charge and several years tacked onto your sentence for no reason when the cops do catch you, boyfriend/dealer/pimp/whatever. Of course, Darrien says, the ploy didn't even work. The cops just called an ambulance for Darrien and kept chasing after the guy, leaving her lying there unattended. So she got up, stole that car, and parked it basically on the doorstep of Hadley's apartment building. Yeah, I'm sure the cops won't figure out where she's hiding. Very clever, Darrien. Hadley interrupts Darrien's boring life story to inform her that she has no blood pressure and almost no pulse in her left arm. Since Darrien is clearly not dead, that doesn't make sense. Hadley puts the cuff around Darrien's other arm, which does register a blood pressure. This means that something must be cutting off the blood supply to Darrien's left arm, and she could really use a hospital about now. Instead, Hadley calls Chase, of all people. He's lying in bed reading a book about the Crusades, but when she asks if he's busy, he claims he's "about to go out." Hadley asks if he can pick up a portable ultrasound machine from PPTH and drop it off at her place on his way. She claims she needs it to figure out why the pipe in her bathroom is leaking.

House finds the Clinical Research Lab open and the underpaid dork who is apparently the only guy who works there in despite the seemingly late hour. Underpaid Dork is packing everything up, which House believes is because the drug trial, no doubt a huge success, is over. Underpaid Dork says the trial ended because all of the test subjects died after developing little rat tumors in their little rat legs. House is clearly ad understandably alarmed at the news. He asks if the rats showed any symptoms that something was wrong. Underpaid Dork says their legs seemed a little stiff and they had trouble picking up little rat guitar amps. A day or two later, they were dead. How exactly do little tumors kill that quickly? Is it because they were cancerous? Doesn't cancer take more than a few days to kill someone? Weird.