I just thought of an idea, small chance but...
I’m recalling a case I saw a long time ago on Forensic Files. It was a “Forensic Botanist” who ended up solving the case and finding the victim who had been discarded in the Colorado mountains. Iirc she was part of a recovery organization....
In that case, iirc LE had collected evidence from the perp which was certain leaves/plants/ foliage ...I can’t recall if it was from his vehicle or shoes, etc but the point is this:
The specific type of plant that they found (iirc related to a kind of Aspen) requires a lot of direct sunlight, or soooomething like that. So the Forensic Botanist was able to determine which side of Canyon got the direct sunlight needed for this type of tree to grow; then they were able to narrow it down to a certain area where the sun actually shined on that mountain and ended up finding the victim’s remains. A skull iirc.
I wonder if any botanical material, etc was found on JF’s shoes, vehicle, etc and if this couldpissibly help shed some light on where he disposed of her up around the mountains. Is there any similar evidence like this I wonder and if so has a forensic botanist examined it. I wish I could remember the group...maybe it was Necrosearch?