Deckard: She's a replicant, isn't she? Tyrell: I'm impressed. How many questions does it usually take to spot them? Deckard: I don't get it, Tyrell. Tyrell: How many questions? Deckard: Twenty, thirty, cross-referenced. Tyrell: It took more than a hundred for Rachael, didn't it? Deckard: [realizing Rachael believes she's human] She doesn't know. Tyrell: She's beginning to suspect, I think. Deckard: Suspect? How can it not know what it is?