There’s actually no purpose to take this declare significantly. It is nonsense, on this case magnified by the horrible state of science journalism.
First, the “scarf” they examined has no demonstrable relation to the case of any variety. Household legend says an ancestor picked it up on the Eddowes scene, however that ancestor labored for the fallacious police division and is not identified to have had something to do with the JtR case apart from the aforementioned household legend. Eddowes’ possessions had been inventoried on the time, and there is not any point out of this merchandise. There’s doubt it had even been manufactured by 1888. Even when it actually did come from her, it has had over a century to get completely contaminated, throwing any DNA assessments into doubt.
After which there may be the precise DNA take a look at. This isn’t the form of take a look at you consider while you hear about DNA profiling. It is really a mitochondrial DNA take a look at, which is totally ineffective for really figuring out a suspect, as a result of an excellent many individuals share similar mtDNA; yours is similar to your mom’s, as an example, and your siblings, and your grandmother’s, and so on. Anybody who shares a direct feminine ancestor with you, just about. There are most likely one hell of lots of people round Europe who match the mtDNA in that pattern. This form of take a look at is barely helpful for excluding a suspect, not for positively figuring out one.
Kosminski needs to be counted as among the many higher suspects as a result of the police at time thought of him precisely that, however the scarf proof is completely nugatory. Sadly, the case stays very a lot unsolved.