Well, one can say we have an illusion of free will.
That is not true. A nuke has no free will, detonate it in a city and it will certainly change the world. We are bound to act as our biology dictates, but we can still cause changes.If No: Then it is safe to assume that we can't effect change on the world around us to the degree that would be required to perform scientific scrutiny.
Now I'm just lost. My original point is that souls have not been scientifically observed. You seem to be talking about just consciousness. I'm fine with calling that your soul, but it's not really what is normally meant.That is to say that in order for our science to be valid, we must accept reality as it seems to be. We seem to have free will, which would mean that science must be done under the assumption that everything we observe is through the work of a freely operating and conscious mind.