Court transcript dated 26 October 2000 in A and others v NBA of crossexamination of Dr Harold Gunson. Dicusses confirmatory assays and when it would have been possible to introduce them what cost the introduction of assay testing would have on blood supply problems with insufficient blood supply practical problems of testing was testing delayed counselling donors FDA approval for assays reasons for delay in testing that at the time there was discussion of liability implications re development of testing crown immunity surrogate testing.