DNA: What does the evidence say?

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shadowraiths

shadowraiths

LISK Liaison, Verified Forensic Psychology Special
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One thing that I believe all of the scientific community agrees upon, is that DNA, as an exclusionary tool, is highly valid and reliable.

In fact, I recall an extensive conversation with a friend back when DNA was just beginning to make inroads into the criminal justice system. One thing he stated, that stuck with me, is "DNA can prove you didn't do the crime, it however, cannot prove you did it.."

I was initially surprised when he said that. But upon further consideration, his statement makes a great deal of sense. Why?

DNA results are presented within the context of probabilities.

For example, if you notice, the analyst uses two important terms/phrases, when describing her conclusions: "eliminated" or "consistent with."

Sidenote: Brendan Dassey appears to have been eliminated as the source, in several tests, and did not appear to be considered in other tests.

The phrase, "consistent with" is extremely important. And while she draws her conclusions with "a reasonable degree of scientific certainty," she does not define reasonable.

Moreover, I do question that they only took samples from the Averys and Dasseys. Why? At the very least, and imho, they should have taken samples from males within Ms. Halbach's circle. After all, they did find the presence of DNA from an unidentified male.

And finally, she notes:

"This match should be considered an investigative lead. Confirmation of this DNA match requires the submission of a biological standard from this individual to the Wisconsin State Crime Laboratory-Madison."

And yet, who did the DA call? The same woman who made the above statement, and managed to contaminate the minuscule DNA found on the bullet, while making an exception to ignore standard protocol (i.e., rule the results "inconclusive.")

Anyway, that is my read, at this point. Or, otherwise put, I remain unconvinced the DNA results against SA is as damning as the prosecution would have us believe.
 
Another user sent me this article recently after discussions of DNA came up on this forum. She is researching DNA for a book she is writing.

http://stories.frontline.org/dna

Lots of information in that article has me kind of amazed, as I think that most of us likely believe that it's 99.9% reliable.

We have no ideas about things like amplification and what exactly that is, and how that can effect the integrity of results.

Here's an excerpt from that article that might peak your interest in giving that link a click if you haven't already :

Last fall, commission member Barry Scheck voiced his concern about the method at a hearing of the DNA subcommittee. Before Scheck made his name disputing DNA as O.J. Simpson’s lawyer, he founded the Innocence Project, which has used DNA to exonerate hundreds of wrongfully convicted people. He said he opposes the use of cutting-edge DNA forensics in court because he doesn't think they have been sufficiently proven. Scheck had been demanding the Office of Chief Medical Examiner make public its internal validation studies on LCN, which it has refused to do. At one point, after an otherwise subdued hearing, he yelled to some of the subcommittee members: “YOU ARE ALL ****ING LYING!”
Click to expand...
Worth a read... trust me!
 
One of the biggest issues for me in the Steven Avery case is the DNA testimony given by Sherry Culhane. Something is massively wrong with this woman's professionalism and work ethic - she testified in his first trial that PB's hair was found on SA's shirt. After such a glaring ERROR - why would the STATE call on her testimony or entrust her with (evidence on) such an important case again??? Worse yet, her latest testimony unearths her consistently shoddy work. And perhaps those working in law can shed light to why the Defence failed to remind the jury and public that she made a mistake previously....because reminding the public could have potentially raised doubts about the blood DNA - and enhance the framing defence.
 
I find it very interesting, (in a hipocritical kinda way) that the same officials insisting DNA evidence proves SA is guilty of murdering Teresa, are the very same ones who will not admit that SA did not rape Penny Bernstein even though DNA evidence proves he did not.
 
Honestly, the TINY amounts of TH's DNA on things is super sketch, IMO, as well as the tiny little piece of SA's DNA on the hood latch. It's suuuuuuuuuuuuuuuuuuuuper convenient that the one thing that proved they were so very wrong the first time is what they hang their hats on to prove his guilt the second go-round.

To me, if Teresa had been in that trailer, there would be more DNA. ESPECIALLY if those cuffs were ever around her ankles. The fact that there are so many teeny little miniscule spots of DNA makes me raise an eyebrow, because they're in the most convenient places: bullet, valet key, hood latch... but none in "obvious" places, like the location/s where she was supposedly murdered. JMO
 
Tawny said:
Honestly, the TINY amounts of TH's DNA on things is super sketch, IMO, as well as the tiny little piece of SA's DNA on the hood latch. It's suuuuuuuuuuuuuuuuuuuuper convenient that the one thing that proved they were so very wrong the first time is what they hang their hats on to prove his guilt the second go-round.

To me, if Teresa had been in that trailer, there would be more DNA. ESPECIALLY if those cuffs were ever around her ankles. The fact that there are so many teeny little miniscule spots of DNA makes me raise an eyebrow, because they're in the most convenient places: bullet, valet key, hood latch... but none in "obvious" places, like the location/s where she was supposedly murdered. JMO
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That's the problem if you let coerced testimony in, you might not have DNA evidence to match the testimony. In the case of trailer rape story, there's zero DNA evidence to support that. But because you want to be able to use Brendan's story, you gotta commit to trying to sell that happened.

We should not what type of tests were used for those questionable pieces of evidence like the key, latch bullet and compare to the tests for the blood which likely didn't need to be amplified.

They maybe get an idea of how questionable they are in comparison, and if they'd be deemed cutting edge tests. If Barry Scheck sees reason to question cutting edge tests, shouldn't we ?
 
In Sherry Culhanes report of laboratory findings , Exhibit 311.


Page 2 Item D1- One red handled toothbrush reportedly belonging to Teresa Halbach.

In the results section just below that, it list that DNA was isolated from the toothbrush ..
However later she states no DNA profile was obtained from this item. So TH's dna profile was not obtained from her toothbrush.
 
Safeguard said:
I find it very interesting, (in a hipocritical kinda way) that the same officials insisting DNA evidence proves SA is guilty of murdering Teresa, are the very same ones who will not admit that SA did not rape Penny Bernstein even though DNA evidence proves he did not.
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what did that guy Kusche say in the Civil Tesitmony.
"Has DNA evidence been fabricated before? YES"

His own question and answer
 
MysticJynx said:
what did that guy Kusche say in the Civil Tesitmony.
"Has DNA evidence been fabricated before? YES"

His own question and answer
Click to expand...

Touché! My thoughts exactly!!!

Guess he had no clue the same person who he thought might have "fabricated" those results was going to be the same chick testing DNA in the Avery murder case. Or maybe he knew Culhane is less than reliable when it comes to DNA testing.
 
Soulmagent said:
In Sherry Culhanes report of laboratory findings , Exhibit 311.


Page 2 Item D1- One red handled toothbrush reportedly belonging to Teresa Halbach.

In the results section just below that, it list that DNA was isolated from the toothbrush ..
However later she states no DNA profile was obtained from this item. So TH's dna profile was not obtained from her toothbrush.
Click to expand...

Item D1: one red handled toothbrush reportedly belonging to
Teresa Halbach.

No DNA profile was obtained from item D1.


It's so odd that they couldn't get her DNA profile from her toothbrush and that the toothbrush had NO DNA profile.

:thinking:
 
Cymbaline said:
Item D1: one red handled toothbrush reportedly belonging to
Teresa Halbach.

No DNA profile was obtained from item D1.


It's so odd that they couldn't get her DNA profile from her toothbrush and that the toothbrush had NO DNA profile.

:thinking:
Click to expand...

apparently it isn't easy LOL

IIRC eventually her DNA was obtained from pap smears.
 
missy1974 said:
apparently it isn't easy LOL

IIRC eventually her DNA was obtained from pap smears.
Click to expand...


I've read the reports multiple times while watching Netflix.

One thing that stuck out was that they took her hair brush from her apartment but no mention of her toothbrush.

It's on page 4 of Wiegerts November 3rd Report
 
missy1974 said:
apparently it isn't easy LOL

IIRC eventually her DNA was obtained from pap smears.
Click to expand...

Yes, that seems to be correct. From day 10 of the jury trial (2/23/07):
Exhibit 325: Slide holder containing pap smear from Teresa Halbach.
 
missy1974 said:
That is the part that doesn't make sense. Fine... he burns her in the pit.... goes through the burned remains, picks out some to take to the burn barrel, and then some to the quarry??? This is the same guy that the prosecution claims was sooooo smart to clean up DNA in the garage/trailer/SUV, yet he picks through the bones to move a few here and few there.

The part that nags at me is... Blaine in his very first statement said that he was burning garbage in the barrels, thought it might have been November 3rd, the Thursday, the same day TH was reported missing. If this is true.... the bones in that burn barrel would have to be put in there after November 3rd, by SA or whoever, because the anthropologist testified that all the bones (from all 3 locations) had the same burning/charring consistency (which means to me they were burned at the same time and were moved, whether you believe he moved a few out of the burn pit, or someone moved the majority to the burn pit). If the bones were there when he was burning garbage on November 3rd, I would think that they would have been burned further, or destroyed further (not sure of the right wording LOL) What I didn't find in the testimony was.... were those bones in the barrel at the bottom? the top? were they mixed in? that is pretty important information, and I think that is why an expert should have been on scene IMO
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So that works both ways. If there was someone else moving bones, the same thing is said for them. The point is someone had the opportunity to move bones around no matter what you believe, or who you believe did it. It was done so the opportunity to do so was there.

There was also no DNA from anyone else in her vehicle. So the real killer and the "planter" were able to move about stealthily planting and moving evidence about while leaving no trace of themselves and no one seeing them. It's all absurd to me the same way some think it's crazy SA would leave bones in his burn pit.
 
Amber29 said:
So that works both ways. If there was someone else moving bones, the same thing is said for them. The point is someone had the opportunity to move bones around no matter what you believe, or who you believe did it. It was done so the opportunity to do so was there.

There was also no DNA from anyone else in her vehicle. So the real killer and the "planter" were able to move about stealthily planting and moving evidence about while leaving no trace of themselves and no one seeing them. It's all absurd to me the same way some think it's crazy SA would leave bones in his burn pit.
Click to expand...

Did LE swab the entire vehicle for DNA ? Or just where the blood spots were found ? And was it just blood from SA found in the RAV4 or did they find additional DNA as well (not counting the hood latch) ?
 
Amber29 said:
So that works both ways. If there was someone else moving bones, the same thing is said for them. The point is someone had the opportunity to move bones around no matter what you believe, or who you believe did it. It was done so the opportunity to do so was there.

There was also no DNA from anyone else in her vehicle. So the real killer and the "planter" were able to move about stealthily planting and moving evidence about while leaving no trace of themselves and no one seeing them. It's all absurd to me the same way some think it's crazy SA would leave bones in his burn pit.
Click to expand...

I am not sure about this at all.... but did they ever find any unidentified DNA in the vehicle? She never had anyone else in her car? her little sisters? her brother? friends she hung out with in Green Bay?

If the logic is that SA cleaned it, it's not logical IMO that he would wipe down the whole vehicle, including the outside, but leave the blood.

Did they ever use luminol in the RAV4 to see if there was maybe other indications of blood that he did clean and he just "left these behind"?
 
Sustained said:
Did LE swab the entire vehicle for DNA ? Or just where the blood spots were found ? And was it just blood from SA found in the RAV4 or did they find additional DNA as well (not counting the hood latch) ?
Click to expand...

No they didn't swab the entire vehicle, I've actually made this point before that DNA is a lucky find when found in a crimescene. I've seen it argued so much though about lack of DNA in the trailer is evidence of his innocence. so I've decided that must go both ways then.
Other spots were swabbed in the vehicle, some came back to TH. They did swab lots of places in the car though.
 
Amber29 said:
No they didn't swab the entire vehicle, I've actually made this point before that DNA is a lucky find when found in a crimescene. I've seen it argued so much though about lack of DNA in the trailer is evidence of his innocence. so I've decided that must go both ways then.
Other spots were swabbed in the vehicle, some came back to TH. They did swab lots of places in the car though.
Click to expand...

Agreed it has to go both ways ... but they never found any of TH's hair/blood in the trailer either, both visible to the naked eye. Personally, I don't think she was ever in the trailer. I'm surprised that nothing was found on the steering wheel though.
 
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