Whatever it is that you're thinking, the reason I have a 'hang up' with ID as science is because there's no evidence for its validity.
Be that as it may, is science by definition incapable of studying matters pertaining to "personhood?"
No. Don't be silly.
What evidence is there that such a thing as "personhood" exists?
Find a mirror.
Must something have a physical form to be worthy of scientific study?
No. Don't be silly.
Do you believe science by definition is incapable of comprehending evidence for intelligent design? If so, why? If not, what kind of evidence would be acceptable?