But in terms of in-universe justification, why would anyone make a replicant? And how could they be better at a job than a human without being easily discernible from a human upon basic medical examination?
They're supposed to be very advanced androids, fully biological. If there's metal parts, run 'em through an airport xray machine, here's your replicant. But if they've got super advanced squishy bits, then it might take a blood test but that should also clear things up pretty quickly. They're presented as stronger, faster, more durable than humans. If they were physically indistinguishable even down to the microscopic level then they should be absolutely no better or different from a human being. All the cops should require at this point is a blood test machine and all the ambiguity goes out the window. But that would ruin the story.
As near as I can figure, the best justification I can think of for a replicant that appears completely human down to the genetic level and whose replicant status can only be ascertained by a psychological examination would be a bit of legal tomfoolery like the IBM compatible clones from the 80's where the instruction set was reverse-engineered. Hey, they're like humans, but the material didn't come from humans, therefore they have no legal rights, you can do whatever you want with them.
But what would be the need? Cheap labor? We already have that all over the world. Slaves? Again, we pretty much have that already. Just read the papers and about the scandals involving domestic servants basically treated as slaves. It gets even worse overseas like in the Middle East.
So, can anyone think of a rationale for replicants that would:
1) Justify why they were created
2) are physically indistinguishable from us
3) can only be detected with a psych test?
Honestly, the only thing I can come up with is that there's a big twist: there are no replicants, it's just a witchhunt used to scare the bejesus out of the populace. Anyone can be a replicant, you won't even know you are, therefore paranoid police powers and bladerunners mucking about. And they are just as much in the dark as everyone else.
We found a replicant! Retire her!
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