I just read this article about the subject of the search parties and it makes sense to me:
Why Civilian Activity Could Compromise the Case
Excerpt:
The dual developments — tightened perimeter control and a public call for volunteers to step back — signal that the investigation has entered a critical phase.
With the FBI actively working to extract additional images of a masked suspect from the backend of Guthrie's security system, according to NBC News, even well-intentioned civilian activity near the scene could compromise evidence or hinder operations.
Link to full article:
Pima County Sheriff asks volunteer searchers to stand down as FBI analyzes evidence in Nancy Guthrie disappearance.
www.newsweek.com
This part which follows is all IMO/MOO -
I just did a quick search re: BLM land around Tucson and found this:
The BLM Tucson Field Office manages more than 600,000 acres of desert, mountains, and grasslands within five southeastern Arizona counties and shares the international border with Mexico.
The BLM Tucson Field Office manages more than 600,000 acres of desert, mountains, and grasslands within five southeastern Arizona counties and shares the international border with Mexico.
www.blm.gov
The sheriff can't stop people from organizing search parties in the vast areas around Tucson, namely BLM lands. Why don't the search parties start there?
If you do a google map search of NG's house and zoom in you'll see that every property is privately owned. At a certain zoom level you can clearly see property lines. I don't see why search parties would want to focus on this area when there are so many desert areas that could be searched and probably aren't being searched by LE/FBI.
Arizona is a gun state, meaning, many homeowners own guns. This is a sensitive time in the neighborhood and these are private properties. I'm guessing LE/FBI doesn't want yet another tragedy on their hands (a homeowner shooting a trespasser). The idea that the kidnappers left her in someone else's yard or on their property seems far-fetched to me, but even if they did - it seems LE is covering those areas.
I hope the frustrated search party participants will consider branching out to BLM lands which are more deserted and perhaps more likely to be a place where the kidnappers might hide a body. As an aside, I live in a community that backs up to BLM land and we are 13 miles outside a populated area. There are many square miles of wilderness between where we live and the closest town and I've always thought it would be easy to abandon a person (alive or dead) in those areas. It's mainly just saguaro cacti, mountains and scrub brush.
Again, ALL IMO/MOO
Editing to add:
This is what I mentioned regarding property lines on Google maps. The houses do look spaced out and as if there would be "empty" land in between, but when you zoom in, every space involves a property line.