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7000 DNA cases to be Re-examined

August 6th 2008 23:41
7000 DNA cases to be Re-examined
dna
DNA- Wash hands before handling

Over 7000 in Victoria convictions involving the DNA conviction are going to re-examined after a case fell apart due to contamination.

For the last 20 years DNA evidence has been used to solve a number of cold cases that were previously considered unsolvable. When DNA sampling began with convicted criminal it was highly controversial mostly due the sensational method employed to extract samples from unwilling participants. In one case a video was released which showed a criminal in Victoria being sprayed with mace and pinned to take a blood sample. His case led to the courts ordering that the sample taken in such circumstances as being unlawful and ordered their destruction. Just across the border in New South Wales DNA sample were taken in a much less dramatic manner by taking a swab from the inside of the mouth. Today the DNA testing of criminals is routine and has led to convictions that were once considered unsolvable.

dna current
This is the current method of taking a DNA sample and does not require blood samples.


The current controversy has created a huge sensation as 7000 cases are looked at again to ensure that no contamination was involved. The Victorian Police Forensic Centre has thus far reviewed 500 of the 7000 as being without problems.

The possibility that there have been some false conviction based upon contaminated evidence will certainly put pressure upon the Forensic Centre to ensure that they have not made a mistake. Yet what must also be taken in to account is the other supporting evidence in the cases and whether DNA evidence was actually the crucial element. In such cases the contaminated DNA will not be enough to quash a conviction. Yet it does put a cloud of suspicion over the technology.
test
Gently stir with controversy

The problem with current DNA testing seems to have arisen due to the advancement in the science over the last 20 years. Much smaller samples and fragments of DNA can be tested these days making the issue of contamination even more damaging.

How this effects the reputation of DNA evidence in court will most likely be dependent upon the results of the 7000 cases. If no other cases are found then it may survive intact. Yet if one person who has been convicted is released then it will have a major credibility gap to patch up.
endless
Endless uses for DNA testing
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Comments
8 Comments. [ Add A Comment ]

Comment by S.L.

August 7th 2008 12:10
As with any other scientific tool, DNA evidence must be gathered and secured to be valid. Mistakes do happen, though, in spite of the best efforts. It's a good thing they're verifying the results, Damo. Exhonerate the innocent and doubly nail the guilty!

Comment by Damo

August 7th 2008 12:24
SLB

Thanks for your comments.

That is the ideal. Let the innocent go free and the guilty become guests of the state for a time.

It is a shame that this seems to be a case of one human error creating a snowball effect.

Comment by S.L.

August 7th 2008 12:29
Human error will always be a factor, Damo, unfortunately. It's always better to be "safe than sorry" when it comes to crime and punishment.

Comment by Damo

August 7th 2008 12:40
It was the problem of human that quashed a case.

Anyway 500 checked okay only 6500 to go.

Comment by D. Armenta

August 8th 2008 14:41
Contaminated how--by the technicians? Does that mean that someone else's DNA got mixed in with the samples?

This sounds like a technical loophole devised by lawyers....is it?

Comment by Damo

August 9th 2008 01:59
DA

Thanks for your comments.

Lawyers love to pick over dodgy evidence.
If the evidence is no longer admissible then whoo hoo freedom.

Yet the contamination in the case that was quashed did exist and so panic has set in. 7000 samples to be checked to stop the lawyers from going nuts and clogging up the courts.

Comment by Timothy Powell

August 22nd 2008 22:20
the issue here will be with what's reffered to as 'low copy number' cases that is the sample size is very small. What the lab tech will do after securing the sample is run it through a process known as PCR which amplifies the ammount of DNA so it can be extensively tested the problem arises in contamination before the PCR step which subsequently amplifies the contaminants as well as the DNA you want. This is becoming an issue worldwide with cases being reinvestigated. These days samples can be taken that are so small that you can't see it, where talking minute ammounts of evidence and so i think it's reasonable that this is happening

Comment by Damo

August 23rd 2008 00:40
Timothy
Thanks for your comments.
I figured it would be something to affect the rest of the world sooner or later.

Your additional information is interesting and worth chasing up so that I can understand it better.

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