Rachael: “It seems you feel our work is not a benefit to the public”

Deckard: “Replicants are like any other machine, they’re either a benefit or a hazard. If they’re a benefit, it’s not my problem”

Rachael: “May I ask you a personal question?”

Deckard: “Sure”

Rachael: "Have you ever retired a human by mistake?”

Deckard: “No”

Rachael: “But in your position that is a risk”