Catherine: Oh, before you came to Nevada you should have looked up the law. Mandatory drug testing wherever there's been an accident. Pee now, and don't tell me you're shy. (to an officer) Stay on him.
Sara: Mandatory drug testing?
Catherine: Yeah, well, there should be.
(Nick and Warrick are collecting dog scat)

Catherine: Oh, Dougie Max was poisoned.
Greg: To the max.

Catherine: Oh, these fire guys really know how to trash a crime scene.
Grissom: That's what they do. Put wet stuff on the red stuff.
[Grissom studies the pieces under the scope. There's ticking sounds coming from around him. Suddenly, an alarm rings. Grissom looks up]

Catherine: Pucks, bucks and... chicks.

Catherine: Sheriff, you arrest Nick now you end his career.
Sheriff Mobley: So, what can you offer me?
Catherine: Nothing, except my gut and ten years of experience. He didn't do this.
Ecklie: Ignore the evidence against Stokes it looks like special favors for CSI.
Sheriff Mobley: Well, I can't have that. Not and keep my post.
Catherine: So give me twelve hours, access to the crime scene and evidence without filing papers on Nick.
Sheriff Mobley: Twelve hours. But then we arrest Mr. Stokes with all the attendant documentation.
(Jack sits at the table in the room. In the observation room, Catherine and Ecklie watch)

Catherine: So how's your new toy working out?
Warrick: It's been downsized.
Catherine: Bummer. I know how you wanted to see that thing work.
Warrick: Well, it's the same difference, really. Air is drawn into the last tube the chalk absorbs the chemicals from the air. And mass spec will break it down at the lab.
Catherine: So why did you need the expensive one in the first place?
Warrick: 'Cause it was cool. (Cath smiles at his honesty)

Catherine: So I suppose you believe in Santa Claus?
Nick: After this... oh yeah.

Catherine: So I understand that you're going up against Mark Thayer? The guy's an ass.
Grissom: Used to be a competent scientist. We actually co-authored a paper together ten years ago. I believe greed has gotten in his way.
Catherine: Well, I've seen him on the stand. He manipulates evidence.
Grissom: He manipulates people. The public assumes that scientists are ethical. But many of us are no better than politicians, evidently.

Catherine: So you did the tox screen on my carny?
Greg: Roger that. You know, I have seen guys drink, like, five gallons of water to try and dilute their urine. It's the old straight flush. But all bad boy Sanders has to do is just test their specific gravity and-- blammo! -- I can still catch their toxic butts.
Catherine: Mm-hmm. So?
Greg: So your guy didn't do that.
Catherine: Great. What did he do? Try and mask it?
Greg: No.
Catherine: Oh, come on. That creep tested clean?
Greg: Yeah. For someone who's on the pill.

Catherine: So, are you thinking what I'm thinking?
Grissom: How amazing the universe is. Everything made from the same carbon, stars to trees, trucks to human bones.
Catherine: Uh, no, I was thinking that we have about 100 bone fragments. We could ID this body before the end of the shift.
Grissom: Hmm.
Catherine: Stars and trucks?

Catherine: So, it's gone from intentional to accidental to personal. Who have we got?
Warrick: Nick's girlfriend (Nick laughs)

Catherine: So, what, this guy has some strange chemical in his mutated DNA?
Greg: Freaky, huh?
Catherine: Freakiest semen I've seen in a while.
Season 2

Catherine: Taking your pet for a walk?
Grissom: I know how much you like my little fetal pig, so I'm giving him to you as an office-warming gift.
Catherine: That is so thoughtful. Now tell me why you really stopped by. You checking up on me?
Grissom: No.
Catherine: What've you heard? Who talked to you?
Grissom: See? You've only been on the job a week and you're already paranoid.
Catherine: [laughs] When I was your right hand and your left, I always knew if it hit the fan, you'd be the one to get dirty.
Grissom: Hey, that's the job.
Catherine: Yeah, that's the job. Did you ever play politics?
Grissom: I once ran for president of science club in junior high. Mary Hardy beat me out by one vote.
Catherine: I'm going to guess that you didn't vote for yourself.
Grissom: I'm not any good at politics. It cost me, that's how I lost Nick and Warrick.
Catherine: Your loss, my gain.
Grissom: Yeah, and at least I know that they're in good hands.

Catherine: The prisoner plea. Brass told me about the video.
Grissom: Yeah. If we take the case we have very little time to work it. The trial starts in three days.
Sara: How did he find you? 1-800 Grissom ...? (Nick laughs)
Catherine: Wait a minute. Ecklie was the CSI on that arson. I see a bad moon rising.
Warrick: Can a CSI take over another CSI's case?
Catherine: Only if they're of equal rank and they're looking for trouble.
Grissom: No trouble. We're both colleagues searching for the truth.

Catherine: The sperm from the condom was frozen at 10:15 am. It's all heads, no tails.
Grissom: I'm not quite up to speed about the preticulars of....
Catherine: It takes about 7 hours for bacteria to eat away at the tails, that places time of ejaculation at around 2am. But Kristy's death was at around 6am.
Grissom: Well, that suggests a lag between ejaculation and Kristy's murder. But that doesn't disprove Nick's presence at the time of the homocide.
Catherine: You could be a little more supportive.