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31
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by EU on April 21, 2021, 02:33:15 PM »
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We determined after filming that the filter we analyzed on the show was contaminated with Tom Kaye's DNA. Therefore, Sheridan was put back on the table as a suspect.

No I saw that, but I thought I read that the FBI had done a comparison on SP that did not exclude him. Am I mistaken on that?

I believe you're referencing Sheridan's picture being shown to the witnesses--presumably Tina.

After the initial investigation into Sheridan the FBI said it was going to show his picture to the witnesses to illicit a positive or negative response and that they wouldn't investigate further until that was done. Then a few months later the investigation into Sheridan picked up again.
32
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by georger on April 21, 2021, 02:01:50 PM »
Like it or not, the Cooper discussion has wandered into an area where some technical competence is required. There is no way to 'fudge it'. 

NIST, the Ntl Institute of Standards & Technology.gov, has a number of intro level pages on genetics and how genetic material is processed.

In the Cooper case one issue is 'multiple donors' or 'mixed dna samples' - How are multiple donors detected in a sample? How are these samples collected and processed and evaluated?

See: You are not allowed to view links. Register or Login

Likewise this page explains the term Partial, see:  You are not allowed to view links. Register or Login
33
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by georger on April 21, 2021, 01:00:07 AM »
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Why has the FBI not uploaded the Cooper DNA profile to GedMatch and attempted forensic genealogy?

case is closed. The DNA Project shut down ?  ... its conflicting trying to read, think, and suddenly having to answer PMs. Dont take it personally. I vowed years ago never to have a pager or similar interrupter device again! When PMs come in here they stop everything a person is doing and switch one over to the PM page automatically, demanding immediate attention. Only after answering can you get back to where you were and what you were doing in the forum ... an incoming PM stops everything in its tracks here ........ maybe you didnt know that. I prefer to handle PM's on my schedule when I have time to read and think about them alone and not have to multi-task after being jerked away from the forums by somebody's PM ... when somebody sends several PM's in a row, it makes life impossible here!
34
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by Chaucer on April 21, 2021, 12:33:10 AM »
Why has the FBI not uploaded the Cooper DNA profile to GedMatch and attempted forensic genealogy?
35
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by Chaucer on April 21, 2021, 12:12:41 AM »
I asked her about if she knew the people you mentioned. She got back to me about it, but since you yelled at me about PMing you, you’ll have to wait lol
36
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by georger on April 21, 2021, 12:04:52 AM »
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The same two that you posted in the news thread.

ok - just trying to make sure I know who and what is doing who and what!  :rofl:  No biggie. Again thanks!! Good work. Thank your friend...
37
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by Chaucer on April 21, 2021, 12:03:18 AM »
The same two that you posted in the news thread.
38
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by georger on April 21, 2021, 12:00:11 AM »
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So, I emailed the two FBI documents detailing the DNA information to my genetic scientist friend (she’s well known, but I’ll protect her privacy for now). This is her response to me:

I just had a chance to read through these two documents.  The first one says that the FBI was able to get DNA from items Q40 and Q41, which they combined.  They were able to obtain a 10 locus CODIS profile from the combined sample.  (Nowadays, CODIS includes 20 loci).  The results indicated that the DNA came from more than one person, but they don't say how many - this is a common because sometimes it's not possible to say how many contributors there are. 

My understanding is that according to CODIS guidelines, a mixture is uploadable to CODIS.  If a suspect is identified, the probability is determined whether it's possible that he is one of the contributors to that mixture.  If the answer is yes, there is more work to do, but I am not sure how they handle that.

The second report (undated but after 2008), says that the evidence was retested, and a male profile was obtained and uploaded to CODIS.  The DNA profile came up with a list of people they wanted to test and compare to the CODIS profile.  But then in 2006, it was decided that the profile was too degraded to identify anyone, but that it could be used to rule out suspects.  But by the date of this report, not many had been tested and compared.

So there seems to be a profile in CODIS that still can be used for comparison, if you manage to get various suspects tested on the CODIS markers.


Not sure if this adds anything to the discussion that hasn’t already been said, but it’s an experts two cents at least.

Could you list the reports/docs you emailed to her?

I concur with her comments - good comments. Tnx!  Her nailing ten loci may indicate she looked up the kit used ... nice.  :)
39
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by Chaucer on April 20, 2021, 11:50:39 PM »
So, I emailed the two FBI documents detailing the DNA information to my genetic scientist friend (she’s well known, but I’ll protect her privacy for now). This is her response to me:

I just had a chance to read through these two documents.  The first one says that the FBI was able to get DNA from items Q40 and Q41, which they combined.  They were able to obtain a 10 locus CODIS profile from the combined sample.  (Nowadays, CODIS includes 20 loci).  The results indicated that the DNA came from more than one person, but they don't say how many - this is a common because sometimes it's not possible to say how many contributors there are. 

My understanding is that according to CODIS guidelines, a mixture is uploadable to CODIS.  If a suspect is identified, the probability is determined whether it's possible that he is one of the contributors to that mixture.  If the answer is yes, there is more work to do, but I am not sure how they handle that.

The second report (undated but after 2008), says that the evidence was retested, and a male profile was obtained and uploaded to CODIS.  The DNA profile came up with a list of people they wanted to test and compare to the CODIS profile.  But then in 2006, it was decided that the profile was too degraded to identify anyone, but that it could be used to rule out suspects.  But by the date of this report, not many had been tested and compared.

So there seems to be a profile in CODIS that still can be used for comparison, if you manage to get various suspects tested on the CODIS markers.


Not sure if this adds anything to the discussion that hasn’t already been said, but it’s an experts two cents at least.
40
DB Cooper / Re: Clues, Documents And Evidence About The Case
« Last post by dudeman17 on April 20, 2021, 09:36:28 PM »
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We determined after filming that the filter we analyzed on the show was contaminated with Tom Kaye's DNA. Therefore, Sheridan was put back on the table as a suspect.

No I saw that, but I thought I read that the FBI had done a comparison on SP that did not exclude him. Am I mistaken on that?
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