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The last factor was considered to be especially significant because analysis of semen recovered from the body of Jean Harrison in Preston showed that the person responsible for that crime was also group “B” and a secretor and was thus within 6% of the total male population. This unhappy coincidence had two effects. First, it tended to confirm that the Harrison murder was part of the series and second, if Harrison was in the series, the blood grouping pointed to the authenticity of the letters. The two propositions were however mutually dependent and, as events were to prove, both wrong.
== 1st May 1979 ==
On the 1st May, following the murder of Bank Clerk, Josephine Whitaker, an entry in the murder log approved the practice of eliminating suspects on the basis of the handwriting from the three "Sunderland" letters.