Replicants are not genetically human. Its within canon, I think, to have the process of creating a replicants be somewhat open loop. Perhaps they encode the beg

Replicants are not genetically human. Its within canon, I think, to have the process of creating a replicants be somewhat open loop. Perhaps they encode the beginning neural structure as a virus that's implanted in developing bodies, but otherwise don't have clean ways of interacting directly with brains and minds (that are not destructive - destructive or even expensive reads are also in scope for canon but not likely to be casually used)