LondonJohn
Penultimate Amazing
- Joined
- May 12, 2010
- Messages
- 21,162
A couple of posts at gritsforbreakfast.blogspot emphasize the need to preserve DNA evidence properly. The latest person to be exonerated was found not guilty on the basis of retesting DNA evidence that was at least 27 years old. Allowing a major piece of evidence (the bra clasp) to rust and rot is either fecklessness or worse.
This is the basis of another false and misleading refrain from many of the pro-guilt commentators. They try to equate the inexplicable 47-day delay in retrieving the bra clasp (and other key items) from the dirty and contaminated floor of the cottage with DNA on items that are tested after decades in storage. The difference, of course, is that the latter items were almost certainly collected and bagged in a timely and correct manner. Once they are properly bagged in a sterile environment, they can be stored for an almost unlimited period of time before being retested, and the results of any retest can be relied upon.
In contrast, many of the key evidence items in the Kercher case were either incorrectly collected, incorrectly stored, left in a contaminated (and clearly heavily disturbed) environment for some six weeks, or a combination of some or all of the above. Any one of the above mistakes will reduce the reliability of subsequent DNA testing; for those items where most or all of these mistakes were made, the reliability is likely reduced far below that required for any sort of proof.
And yes, the sheer fact that the police forensics "experts" (presumably from the "gold standard" lab of Stefanoni) stored the bra clasp in an unsuitable container that was airtight and watertight (and which therefore made the clasp rust and rot) can only be explained by one of two reasons: sheer negligence and incompetence, or a deliberate attempt to destroy evidence. Needless to say, neither of these alternatives reflects particularly well on the police...
