In both Blade Runner and Minority Report, there is a question of what it is to be human. The replicants are treated as sub-human, so they get no rights and their life span is set to four years. These androids are sent to the Off World which is another planet that is becoming habitable to humans.
Society is scared of the androids' intelligence. So limiting their lifespans and keeping them on another planet protects the humans. These replicants begin to become so much like humans it is difficult for Harrison Ford to distinguish them.
Both films show a future that is suffering from society's attempt to make advancements in technology only to bring us back to contemplate on humanity. W. A. Senior talks about the importance of this dirty and hostile world. Without this type of condition, the non humans would not have come into existence. Our world is slowly holding onto an illusion of a peaceful nature, yet, sadly, our future is becoming more dependent on technology.
So, the predicament arises. We create these androids to save our race, yet we don't treat them as humans because they are merely slaves with an expiration date. But, what makes us human? and how can we differentiate human from replicant?