Does anyone else think they might want to consider looking in the area of "The Zone of Death" if nothing shows up in Grand Tetons? It is located just outside Grand Tetons National Park, where they were last seen, on the Idaho side of Yellowstone National Park.
This stretch of Yellowstone National Park presents a unique loophole. It has been refered to by Brian Kalt in the Georgetown Law Journal as "The Zone of Death" when he wrote a piece called 'The Perfect Crime.'
Trials in Yellowstone National Park would be held at the federal courthouse in Cheyenne, Wyoming. However, in the 6th amendment it decrees that juries in federal criminal cases must be made up of citizens who are from both the district AND state where the crime was committed. This is where the loophole comes in, that area of the park in Idaho would have to be tried before a jury consisting entirely of residents of that area, and the trial would also have to take place in that area. Unfortunately, that Idaho portion of the park is uninhabited, making it impossible to make up a jury of residents of both the state and district. Any defendant facing a felony or misdemeanor charge would be unable to receive a constitutional trial which could not be legally punished regardless of guilt or innocence according to Brian Kalts writing.
I mention this because Brian and Gabby both seemed to be avided readers, they had books with them such as Lullaby, The Zodiac Killer, Fight Club etc. There is a great thriller book by CJ Box called 'Free Fire' it is based in this particular stretch of Yellowstone National Park and CJ Box even consulted Brian Kalt when writing his book. As it definitely falls into the genre that they seemed to enjoy reading and it was based in an area they planned to travel to, I wonder if one or both of them could have read that book.
Brian also seemed to be very aware of his legal rights and I wonder if it was premeditated could he have known about this strange loophole in that stretch of forest? Of course, this is all speculation and purely based on the genre of some of the books they were reading along with the very close proximity to where she went missing, it's a stretch but also an interesting coincidence. I hope something turns up or someone eventually cracks and her family can have some type of closure.