Surely, after a decade it should be fairly easy to detect Prp_sc levels, or at least extract bone marrow sample for examination. That should eliminate beyond any reasonable level of doubt, any reason for worrying about the matter.
Red Cross rules: " You are not eligible to donate if:
From January 1, 1980, through December 31, 1996, you spent (visited or lived) a cumulative time of 3 months or more, in the United Kingdom (UK), or From January 1, 1980, to present, you had a blood transfusion in any country(ies) in the (UK) or France. The UK includes any of the countries listed below. ... "
http://www.redcrossblood.org/donating-blood/eligibility-requ...
>At present, there is virtually no way to detect PrPSc reliably except by examining the brain using neuropathological and immunohistochemical methods after death. Accumulation of the abnormally folded PrPSc form of the PrP protein is a characteristic of the disease, but it is present at very low levels in easily accessible body fluids like blood or urine. Researchers have tried to develop methods to measure PrPSc, but there are still no fully accepted methods for use in materials such as blood.
https://en.wikipedia.org/wiki/Transmissible_spongiform_encep...