As you might imagine, the creation of these replicants doesn’t go entirely smoothly.
They are built with enhanced abilities to allow them to be better workers, but also aren’t made to have the same kind of emotional responses to stimuli as humans, and do not possess empathy.
They are not allowed on Earth because of the potential danger they represent, and were purposefully built with short lifespans as a safety measure, but they still manage to become a serious threat when they start questioning their roles in society and rebel.
There are more advanced models who don’t even know that they are replicants and technically hide in plain sight, but in order to contain the danger of the mass-produced versions, a special police task force is formed specifically to contain them…