But it's not because the DNA on the sheath could have been deposited on the sheath at any time before the murders not just on the day of the murders. BK could have sold or traded the knife and sheath or it may not have ever belonged to him - he might have held the sheath at some point in time such as in a store or at a friend's house. There are literally a million ways BK's DNA could have come to be on the sheath that don't involve him being the murderer. And that is a huge problem for the prosecution.
I hope that the prosecution has something solid but they have not revealed it to the defense thus far and the trial is quite soon so I'm very concerned.
Kohberger and his lawyer filed this objection because they are seeking a detailed breakdown of how genetic genealogy was utilized to help the FBI initially identify Kohberger as a person of interest in the case.
www.insideedition.com
Mentioned by SG not LE, but apparently NOT in any of the discovery the defense was given. Or possibly something explainable (and provable) by the defense in a way that LE and the prosecution has not considered.
There is much more to forensically extracting data than just the devices. LE would have extracted at the carrier level. Legally carriers are required to keep all original messages for two years and LE subpeona's them to see what was actually sent on what date and what time compared to what appears on the devices. By doing this, LE can also see if an effort was made to change the message, send date or time or all 3 in some way by the device user. If there is a company between the carrier and device, LE would subpoena them as well because, they too, are required to keep all messages for 2 years. This gives LE the ability to see the full range of custody of the message and anything that may have happened to the message between the time it was originally sent and when LE took it into evidence. LE will typically subpoena messages for a specific date and time range, so even messages that were deleted on the device are visible to LE.
If it is an Apple Device, while Apple will not unlock the device, LE can subpoena messages from iCloud which also stores the encryption key which LE can avail itself of.