- Nick Stokes: [after Nick discovers a knife in Russel Caris' car] Why wouldn't he have thrown that knife away? He's not smart.
- Al Robbins: [laughs] This is natural selection. The dumb ones die.
- Gil Grissom: Hello, David.
- David Phillips: Hello, Grissom.
- Gil Grissom: David Phillips, everyone. Our excellent assistant coroner and baseball trivia expert.
- Jim Brass: How many floors we got?
- Catherine Willows: Well, no 13th. No 4 and no 14. Yeah, unlucky numbers. Different countries, different superstitions. That was something Sam taught me.
- Donna Basset: [about Mr. Hsing] Every time he came to Vegas, he would gamble for four hours exactly. And, you know, I took that bath every time.
- Warrick Brown: Why did you kill your wife, Mr. McGill?
- Gavin McGill: You try having a hot wife. You pay for it every day.
- Al Robbins: [about Russel Caris] What was going through his mind just before he crashed into the police cruiser? "I want to die today and take somebody with me"?
- Gil Grissom: Part of being a CSI is learning to work in the absence of absolute certainty. Each and every case brings us a new opportunity to learn something. For instance, in the case of Donna Basset, we can see that there is no such thing as an insignificant detail.
- [points to Rebecca McGill]
- Gil Grissom: Here, the evidence itself can bear witness. Don't just look for what you think you're going to find.
- [points to Jack Day]
- Gil Grissom: And this one, never impose logic on an illogical act.
- [points to Ray and Lou]
- Gil Grissom: And finally, if the evidence changes, your theory must change as well. Questions?
- Male student: [raises his hand] How do you deal with the smell?
- Gil Grissom: You get used to it.
- Male student: I'm not sure I can do this.
- Gil Grissom: Well, not everyone can.
- Smart Girl: Why do you do it?
- Gil Grissom: Because the dead can't speak for themselves.