House is still doing his leg-strengthening exercises. I'm not sure why this is taking him away from his work and making him so unresponsive now that we know he isn't strung out on heroin all the time. After another agonizing session, he prepares to shoot up again, only to find that he's out of his experimental drug. So he heads to what appears to be the "Clinical Research Lab" at PPTH and bothers the scientist there, asking about the drug's progress. The scientist says things are going really well for the lab rats, even better than the last time House stopped by for a random visit and a bunch of drug packets turned up missing right after he left with bulging pockets. House asks if they've done any studies on the maximum dose someone can take. The scientist says they haven't, but they aren't too worried about it because this drug is "excreted through the urine," meaning that as long as the rats drink enough water, they'll never overdose. The scientist is so excited about this that he leaves the locked safe full of drug packets open, and House takes advantage of the opportunity and asks the scientist to go get him some coffee while he rests his hurting leg. After he calls him an "underpaid dork," of course. As soon as the underpaid dork is out of the room, House grabs a bunch of experimental drug packets. I guess no one will miss them, since they clearly don't take any kind of inventory of their supply or take any measures to keep people from stealing it beyond putting it in that safe. And then opening the door to the safe and walking away.