Pondering the following...
Two vehicles: a Truck. an RV.
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1) first vehicle has a cabin and a truck bed, both areas visible from outside the vehicle. Be careful what you do.
2) second vehicle is fully-enclosed; one may not see inside unless one enters the vehicle or peers through non-obscured windows. Do whatever you want.
Unless LE might obtain video that shows
a person (under their own power) entering the Truck or RV immediately before they traveled to the reported desert location and video that shows
a person (under their own power) exiting the Truck or RV at that same location and video of
a person (under their own power, away from
another person who mighty be, say, 'taking pictures') walking back toward the Truck and RV and being abducted at or near a road, then we may have reached a certain point:
(below is a repeat post)
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There is a threshold point when a person guilty of having committed a crime begins to feel safe, that the feeling or pressure to confess diminishes, that LE seems to have no workable evidence and... the person begins to either wrongly or rightly believe they might just get away with it.
Has that threshold point come and gone?
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Would the most sparse circumstantial (i.e.: conjecture) evidence in, oh, maybe a case similar to one discussed in this forum, be enough to legally charge, try and convict someone?
Good luck.
...here's to hoping there's more than sparse circumstantial evidence...