Originally posted by John G
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If the police were negligent, and did not test, then the probability that Wallace was guilty rises a small amount; this can be debated. There was certainly no obvious blood trace on Wallace, however, and his clothes were tested using Benzidine.
As I'm sure you know, the police were not statutorily obliged to pass on ALL evidence in the UK until 1996. If the police tested the nailbrush and drains, found negative results (i.e. no blood) which they interpreted as a non-result and did not report the findings, they would have hidden evidence that almost certainly would have cleared Wallace.
The fact that there is no documented evidence of testing is consistent with both possibilities. In my updated book, I describe something interesting about the chain of evidence regarding the nailbrush...
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