I can easily agree with this logic, though my ideas are somewhat varying. Why do we let rapists, child molesters and murderers fester in prisons when they could be contributing by being involuntary test subjects for the betterment of a new tomorrow? We wouldn't even need to test on animals then. Despite what the majority thinks, I believe aborted fetuses are fair game as well. The benefits of their untainted cells could prove resourceful in curing all kinds of human ailments.
Sure. Prisoners have given up their right as citizens anyways. Though most rapists and child molesters get out at a certain point, as do some murderers, so I think testing on prisoners would only be done with life sentences or death row. It also invites abuse of the system, so there's that to contend with. And human rights violations. It would be universally panned by the UN.