Mac Taylor: Science is our integrity.

Mac Taylor: Significant blood loss. She couldn't have gone far. She was murdered right here in the school grounds.
Don Flack: Usually you tell your kids to be careful coming home from school, not through it.

Mac Taylor: Since when were Stalin, Khrushchev, and Beria ingredients in water?
Lindsay Monroe: Never...
Sheldon Hawkes: I don't think there's 1947 calories in it either.
Jo Danville: Where did that water bottle come from?
Sheldon Hawkes: Vics' backpack.
Mac Taylor: [Looking at the water bottle closely] Heh, Multiple Choice. 1-T-D
Lindsay Monroe: 1947. TD. Truman Doctrine.
Mac Taylor: 2-M-P
Jo Danville: Marshall Plan.
Mac Taylor: 3-N-S-A
Lindsay Monroe: National Security Agency.
Mac Taylor: National Security Act, Agency wasn't formed until 1949. Everything on this bottle has been replaced with information pertaining to the Cold War.
Jo Danville: All the answers to the test. It's a cheat sheet.
Sheldon Hawkes: That's impressive.
[Mac looks at him wondering]

Mac Taylor: So how'd your negotiation go yesterday?
Jo Danville: Negotiation?
Mac Taylor: Your daughter seems rather determined to vacate New York City.
Jo Danville: She can be a stubborn mule like her mama. Seldom shy about what she likes and doesn't like.
Mac Taylor: Being thrown into the deep end is never easy. It helps to know there are people around that have your back.
Jo Danville: Well, Ellie's a tough kid. She's going to be fine.
Mac Taylor: I wasn't talking about Ellie.
Jo Danville: Thank you.

Mac Taylor: The bodega was just around the corner. She [Olivia] went to get you some aspirin.
Natalie Dalton: And when I woke up a couple hours later, she was gone. I went through the entire building, knocked on every door, went through the streets screaming her name. I haven't had a drink since that night. That's what it took to open my eyes. But it was too late.
Mac Taylor: It's never too late.

Mac Taylor: The stereotype is kids run away to join the circus. Where do kids already in the circus go?
Stella Bonasera: Apparently the elephant enclosure.

Mac Taylor: The way I feel has never affected the way I do my job.
Don Flack: My weakness, I guess. Every hood Truby ever collared is going to be angling for a get-out-of-jail-free pass. Clay Dobson was just the first in line.
Mac: You having a good time, saying I told you so?
Flack: No.

Mac Taylor: This case has been sitting on the edge of my desk for the last nine years.
Don Flack: You got a new lead?
Mac Taylor: No.
Don Flack: Is the chif asking about it?
Mac Taylor: Nope.
Don Flack: Then, whats up? Why you looking into it now?
Mac Taylor: No reason.

Mac Taylor: This writing style is very unique. Look at the I's. Exaggerated slant. Alternating capital and lowercase letters between words. Someone may be able to recognize it.
Adam Ross: I'm not sure I follow.
Mac Taylor: We use it like a missing persons billboard. Instead of a face, we use this. 'If you recognize the handwriting, call the NYPD tips line.' That kind of thing. See? Out of the box thinking. Get it out to every media source you can think of. I want it on electronic billboards, too.
Adam Ross: All over the state?
Mac Taylor: The country.

Mac Taylor: Three dead bodies isn't the kind of buzz you want.

Mac Taylor: Uncovering mistakes made by your lab and alerting defense counsel was part of your oath. Still is.
Jo Danville: Tell that to Senator Matthews. I still get letters from him blaming me for the outcome of his daughter's case. The mistake I uncovered was made by a guy named Frank Waters. Impeccable reputation. I worked with Frank Waters for 12 years, Mac. I went to his wedding, his kids' birthdays. So when I discovered he destroyed a document detailing a mistake he made interpreting DNA results, trust became just another word and Serena Matthews' rapist went free.
Mac Taylor: You had to make it public.
Jo Danville: It was a decision I don't regret making and I'd make it again.
Mac Taylor: Jo, my team does not sacrifice integrity for a desired result. Now that you're part of it, I promise you you'll never have to make that kind of decision again, okay?

Mac Taylor: We processed this thing when the crime occurred and we never got a second donor. Why would it be different now?
Sheldon Hawkes: Well, I used a different genetic analyzer. Every instrument varies in sensitivity. If I ran it through a third one might not pick it up but this one did. Machines. Sometimes there's no rational explanation for why they do what they do.

Mac Taylor: We want a reference sample.
Tony DeLuca: What, so you can put it on some government database? Forget it, I know my rights.
Flack: Yeah, we've got rights, too--they're called warrants.

Mac Taylor: We've got the best forensics tool money can't buy. Snow.

Mac Taylor: What am I doing? How much longer can I do this?
Jo Danville: So that's why you went back to the bodega homicide, the last unsolved case. You wanted to see if you could find some closure.
Mac Taylor: I've done a lot of good.
Jo Danville: Yeah.
Mac Taylor: Maybe I've done my part.