I haven't read the K. W. Jeter sequels, but I assume this question would be addressed in them. If we're only talking about Dick's novel though, I don't believe there is an answer. It's deliberately ambiguous to illustrate the lack of disticintion between android and Human. I don't think Dick wanted us to walk away wondering "was Deckard an android or a human?" but rather "can we ever really distinguish between the two?" He simply uses Deckard as an example. I don't know about you, but I was emotional about him killing the androids. Does that make me a replicant?
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