My understanding of the IGG/DNA situation is that the FBI used the IGG database to match with BK prior to the LE being able to identify him using the video/cell data.
I don't think that is correct----here is what was released about the process. It seems they were looking at BK BEFORE the IGG match
Police say cell phone records show Kohberger's phone near the murder scene at least 12 times before the night of the stabbings, starting in August.
www.cbsnews.com
University leads police to a name: Bryan Kohberger
On Nov. 25, the Moscow Police Department asked regional law enforcement to look for a white Elantra. Three nights later, a WSU police officer ran a query for any white Elantras on campus.
One came back as having a Pennsylvania license plate and being registered to Kohberger. Within half an hour, another campus officer located the vehicle parked at Kohberger's apartment complex. It came back as having Washington state tags. Five days after the killings, Kohberger had switched the registration from Pennsylvania, his home state, to Washington, the affidavit said.
Investigators now had a name to go on, and further investigation yielded more clues. Kohberger's driver's license described him as 6 feet tall and 185 pounds, and his license photo showed him to have bushy eyebrows — all details consistent with a description of the attacker given by a surviving roommate, the affidavit said.
More research revealed that Kohberger had been pulled over by a Latah County, Idaho, sheriff's deputy in August while driving the Elantra. He gave the deputy a cellphone number.
Armed with that number, Payne obtained search warrants for the phone's historical data. The location data showed the phone was near his home in Pullman until about 2:42 a.m. on the morning of the killings. Five minutes later, the phone started using cellular resources located southeast of the home — consistent with Kohberger traveling south, the affidavit said.
There was no other location data available from the phone until 4:48 a.m., suggesting Kohberger may have turned it off during the attack in an effort to avoid detection, the affidavit said. At that point, the phone began taking a roundabout route back to Pullman, traveling south to Genesee, Idaho, then west to Uniontown, Washington, and north to Pullman just before 5:30 a.m. — around the same time the white sedan showed back up on surveillance cameras in town.
So from that IGG identification, LE worked backwards to find the evidence that puts BK at the crime scene.
No, it seems that the opposite happened. They had video of a white Elantra first, then 3 days later found BK's name on the list of student parking permits---and they were interested because his driver's license info showed he fit the general description.
Then they got a warrant for his phone records, which showed many red flags.
It was LATER ON that the IGG search brought up the family name of Kohberger. And that's when they realised they were already looking at someone with that name.
Why this is important (to me) that the IGG was done legally is because of “fruit of the poisonous tree”.
It was done legally, IMO. There was no poisonous tree involved here. They used the legally allowed databases for this search.
My own concerns are that if it is not done legally, it could affect their ability to use that IGG result and in turn, lose all the further evidence they were able to get because of that result.
Is that^^ the concern? It seems more like a goal than a concern, IMO.
However, there’s always “inevitable discovery” so I won’t opine which way the court would favour if they did find issue with IGG result. I am just sharing my own opinion and concern.