Question for you more experienced sleuthers: in past cases, when the FBI was called to help, what sort of evidence was being collected early on?
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uts hand up::
If you take a look at the Gannon Stauch case and its eventual Arrest Affadavit, it would include:
Cell phone records
Records from vehicles as to vehicle whereabouts
Google records and analytics for various parties
Information from any apps on phones or other devices, including smart watches
Text messages from any source
Home security company records
Bank account information, including credit card transactions
Sophisticated forensic evidence (such as DNA but also variants on luminol analysis and other trace evidence forensics)
Investigation of other person's cell phones, after obtaining warrants
Digital "footprint" (online activities, typical behaviors online, etc)
Right now, I'm guessing the #1 priority is to check out whether anything LE has been told by any of the family or friends is consistent with the above.
<modsnip: No MSM or LE reports wrt Suzanne's phone>
Meanwhile local LE will be contacting locals for dashcam or other videos, etc. or other evidence obtained locally. FBI is expert on the digital side, but also on the special forensics side (helpful in blood spatter analysis if needed, touch DNA, etc)