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Aiden: I lived in a 6 story walk-up in Brooklyn, you could hear the rats scampering on the staircase above you. They didn't even flinch when you passed them.
Mac: That's because they recognised you, they like familiar surroundings.
Aiden: What they liked was my grandmother's sofa.
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(Flack apprehends a suspect at a restaurant)
Suspect: Hey! I didn't do nothing man.
Flack: Yeah? You got steak sauce all over my shoes.
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(A rapist's semen doesn't have sperms)
Stella: So our rapist was shooting blanks?
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(After examining Jordy's corpse, Mac notices the peculiarity of Jordy's gunshot wound.)
Mac: Looks to me like something exited our entrance wound.
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(Stella and Dr. Giles are discussing how the semen they found on the rape victim has no sperm cells.)
Stella: Which means we can't compare the semen from our rapist to the blood sample we got from Donovan Tracey. (She sighs)
Dr. Giles: Catching this guy just got a lot harder.
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Stella: She was in Central Park.
Mac: Looks like we've got ourselves an 800-acre crime scene.
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Stella: Six plus one is seven; three plus four is seven...
Danny: Five plus two is seven. Consider all possibilities.
Stella: Exactly.
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Danny: We have a semen sample from our rapist with no sperm. We've got one from him with no sperm. Matching nothing and nothing, that will count for something.
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Mac: Aiden's on rodent patrol. I'm waiting to do a rat-topsy.
Stella: Rape and rats. Worlds apart.
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Aiden: (flashing her badge) NYPD. Crime Scene Investigators.
Shop-keeper: You people deal with rats?
Aiden: Only when they've eaten our evidence.
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Mac: You're telling me a rat ate the bullet.
Hawkes: That was dessert.
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Dr. Giles: A rapist who left behind no DNA. Perfect crime.
Stella: There's no such thing.