But I still do not understand why there is no unknown DNA belonging to the actual rapist/murderer. The problems which you envisage would seem to produce more profiles than there could be people who left their genetic fingerprint.
Until you have some expert evidence to say that profiles can vanish when contaminated you have difficulties in showing that Hanratty's DNA was not properly identified.
Until you have some expert evidence to say that profiles can vanish when contaminated you have difficulties in showing that Hanratty's DNA was not properly identified.
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