Dear Father Gregory,
What a splendid example.
My thoughts, as one who has no canon law training, begin with the question: What would Jesus do?
I feel you are quite brave to place yourself in a situation where there is an obvious potential for conflict between the civil law and your Christian compassion.
In this case I think I would take the matter further, with a view to bringing about first, a sensible resolution of this particular case (which I regard as allowing the claim), and second to highlight to the legislators the weakness of laws framed in such a way. I assume that there is a higher court to which this can be referred, not to get you off the hook for the decision, but to achieve the sensible outcomes.
I wonder if there is a parallel here with the notion of alibi? If you have an alibi it is regarded by the court as demonstrating that you could not have been involved in the matter. Surely the medical condition of this claimant amounts to pretty much the same thing?
It seems to me that civil law is there to serve the people and provide a framework for societal behaviour, not to impose unnecessary restriction when matters are beyond the control of the individual. Canon law is perhaps a little different, (and I am sure you will correct me) in that we are dealing with God's law, which begins with love and compassion, and He would surely permit this man to claim under such circumstances.
With love and prayers,