@PaulR do you have a link handy for this? I can’t find a formal, operational definition anywhere. I’ve looked here, specifically for SAR terms:
https://www.mngeo.state.mn.us/commi...2011_1118_Published_Land_SAR_Addendum_1.0.pdf
and did a google search of “what does “no trace” mean in a missing person search”
and found nothing (a search of the word “trace” in the pdf doc returned zero results)
As an aside, my google search results included this highly interesting (at least to me and I think people here following Barbara) article by Outside magazine Online titled “How 1,600 People Went Missing from Our Public Lands Without a Trace”.
How 1,600 People Disappeared on Our Public Lands
The article highlights the case of 18 year old Joe Keller, who went missing 7/23/2015 with some similarities to Barbara
“Joe left his phone and wallet at the ranch house. He wore only red running shorts, blue trail shoes, and an Ironman watch. Shirtless, with blond anime hair and ripped muscles, he looked more like a California lifeguard than a Tennessee farm kid. ”
The following article published after his remains are found closely parallels our efforts and theories here on WS, even including a wild animal and snake theory as causes:
Joe Keller: The Runner who Never Returned
Edited to include “even...causes”