Briscoe and Logan are arresting a suspect who's on the phone.
Briscoe: [Takes the phone] He'll call you back in 25 years.

Stone is cross examining a Navy Captain accused of murdering a female Lieutenant.
Stone: What about the prostitute eyewitnesses saw you with, Miss Tammy White? They reported that you got very angry towards her-
Captain: That bitch deserved it!
[A brief silence]
Stone: Which bitch is it, Sir? Lieutenant Hagen or Tammy White?

Stone is delivering his closing statement in the trial of cops who were accused of allowing a gay cop die instead of helping him because they hated gay people.:
Stone: So, let's suppose that it's true what Defense Attorney Schell implies that each of you, all of you, sympathize with the defendants, trapped as they are in their fears; that, in fact, more people hate homosexuals than are willing to admit, then I venture to say that somewhere in your family history, someone somewhere hates you or your relatives for no other reason than that they are black or white, Slovak instead of Czech, Protestant instead of Catholic, left-wing not right. And are you going to let officers of the law determine which of you they will help based on who and what you are? If so, then don't dial 9-1-1, even if you think you're one of them because you may end up being Officer Newhouse. These defendants let a man die and, for all of us, you must hold them responsible.
Season 4

[a serial killer has avoided the death penalty]
Stone: I don't know, I think 25 to life is pretty good.
Robinette: I know two people that would call it a gift.
Stone: Maybe this would cheer them up. [hands him a newspaper]
Robinette: The obituaries?
Stone: Richard Speck murdered eight nurses and died in prison. He was 49. Cheney's 42.
Season 3

[after he kills the man who molested his son]
Sid Fisher: Somebody shot an animal. Call a vet.

[After O'Connell has dismissed lethal IRA operations as 'human error'; following the testimony of a woman whose family was killed by a bomb O'Connell himself planted]
Stone: [To O'Connell] Take a good look. There's your "human error".

[an elderly witness has called the police department]
Van Buren: Any one of you have a girlfriend in a nursing home?
Logan: That would be Lennie.

[Arthur Gold has lost the case to Stone.]
Arthur Gold: You're not that smart- you never were. [grins] Call me, we'll do lunch. [He drives off.]
Robinette: You'd really eat lunch with him?
Stone: Oh, maybe. If he orders crow.

[Briscoe and Logan arrest a rock star]
Manager: We'll sue you for false arrest. We're going to get our lawyers.
Briscoe: Oh, lawyers. I'm so scared. You hear that, Mike?
Logan: Oh, I'm shaking in my blue suede shoes.

[Cerreta and Logan are investigating the death of a teenager due to a defective pacemaker. They have discovered it was second hand, and was in somebody else beforehand.]
Cerreta: This pacemaker has a lifespan of five years; That first cardiologist said it was in Mrs Barnett for three years.
Logan: That's right. And Halin said when he implanted it in Roberto, it was three years before the expiration date.
Cerreta: How's your arithmetic?
Logan: I know that three plus three equals Murder Two.

[Greevey has arrested a prostitute]
Jolene Curtis: You said you weren't a cop.
Greevey: I lied.
Jolene Curtis: Isn't there some kind of a legal thing about that?
Greevey: What, lying? I'm allowed to lie. They pay me to lie.

[In an undercover job, Cerreta has been shot by a gun dealer]
Cerreta: Thirty years...I never even...fired...

[Logan and Cerreta interrogate a hungover suspect.]
Logan: Where'd you go after that?
Chuey: No se.
Logan: No se? Or won't se?

[Logan and Cerreta jokingly discuss the alibi of a cab driver]
Logan: It's not bulletproof. I used to drive a cab- I'd some nights park outside of Susan Dennis' house, take care of business, and pay the fare myself.
Cerreta: [chuckles] So that would have been what, three or four minutes?
Logan:[grins] More like a trip to the airport.

[Logan Greevey are interrogating Diz Williams, a suspect in the murder]
Mr Williams: My boy is 13, you can't do nothing like this! You gotta go to juvey, you gotta-
Greevey: We can do plenty when it comes to felony homicide, Mr Williams! So if you don't wanna blow parole, just shut up!