Quote from Adrian Monk in Mr. Monk and the End (Part One)
Adrian Monk: They are all here. Captain Stottlemeyer: What's all here? Adrian Monk: The pill bottles. See, here is the inventory. 58 bottles. And 58 bottles. He didn't take anything. Captain Stottlemeyer: So it was a setup. He wants us to think junkie. Adrian Monk: Looks like the killer stuck around for awhile and used the computer. Natalie: How do you know? Adrian Monk: The mouse is on the left side, but Dr. Nash is right handed. Lieutenant Disher: How do you know that? Adrian Monk: He was right handed 12 years ago.