All MOO.
IMO, it must have been a partial DNA sample - especially if it was on the button on the sheath which is made of brass which contains 60% copper which degrades DNA on contact. The problem with touch DNA is that it has a high rate of false positives due to contamination.
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JMO. From what I understand the DNA was not originally found when the sheath was examined, then in a second examination ISL found the DNA, and ran it through CODIS but didn't get a hit. The person might not have been in CODIS, the sample could be contaminated and therefore, no match was possible or it was degraded and therefore, again, no match was possible. At any rate ISL didn't get a name from CODIS. JMO.
IMO. So the thought was to use IGG to reverse into and identification of the family of the killer and then find the killer's name from the family group. IGG usually leads to thousands of people and then they have to wade through all of these people to find people who could be suspects. This usually results in a pool of suspects, each which must be looked at in great detail. A lot of this process is research and the opinion of the researcher as to whether each suspect could be a fit. For example, they exclude people who were too young to have committed the crime. Sometimes, the IGG researcher is lucky and the name of the suspect turns out to be someone LE was looking at back at the beginning of the case. Sometimes there needs to be a deep dive into multiple suspects. In a current criminal case like this, this has never been done before. It has been done in historic cold cases with some success and used to identify the remains of Jane Doe's and John Doe's. However, based on what AT said at the hearing, Othram was not able to do anything with the DNA. There has to be a reason for that. And I think the most likely reason is that the DNA was degraded or contaminated. Othram's IGG process usually takes 6 weeks or more. But after 1 week, the FBI took the DNA from Othram and somehow came up with an IGG AND a suspect in 1 week. Suspicious? I would say so. JMO.
BK had sent his DNA into a database for ancestry research purposes...
...and apparently opted out of LE using his DNA. According to what AT said at the hearing last week, BK's name came up via the FBI going into databases they should not have been going into and violating their own policy and not keeping records, behind the scenes and in secret. Prior to that time MPD Detectives had never heard the name BK.
Above comments are made at around 1:23 in the video
JMO
The problem with all of this is that if the DNA was degraded and/or contaminated, then it could easily point to the wrong suspect. And IMO, that may be what has happened in this case.
All JMO.