I always like to mention how Paula Broadwell was identified as David Petraeus' mistress as it's a good example of how even without a phone you can still be identified.
- FBI had three distinct IPs linked to emails
- They geolocated those back to 3 different hotels
- They pulled the guest list from each of the hotels
- Did a "join" on them and the only guest at all 3 was Broadwell
https://en.wikipedia.org/wiki/Paula_Broadwell#Petraeus_affai...
When news broke about the affair, I remembered, 6 months prior, watching an episode of the Daily Show where Jon Stewart interviewed Paula Broadwell and they even made jokes about if her husband was jealous of her spending so much time interviewing David Petraeus.
https://archive.org/details/COM_20120127_020000_The_Daily_Sh...
It's also a good demonstration how probable cause is supposed to work.
In this case, the subpoena probably looked something like "this email must have been sent by one of your guests, so give us the guest list and we'll cross check and find the guy".
Contrast with the geofence subpoena. "Hey maybe some small % of people carry a phone that might send its location to you, can we check if they did?" It's ludicrous.
> give us the guest list and we'll cross check and find the guy
An entire guest list is still a broader fishing expedition than should normally be permitted. Warrants should be much more targeted than that. (Of course, many companies seem happy to give overly broad information without even requiring a warrant...)
A guest list on a single day seems pretty fine grained if you looking for someone who was there on that day.
Im not sure how they would get much more fine grained than that without already knowing the answer ahead of time.
The whole Petraeus affair[1] is a wiki 'telenovela'. The only things missing are references to Corintian leather. I will share gossip tomorrow, even if old news.
[1] https://en.wikipedia.org/wiki/Petraeus_scandal
This is also a great example of map resection.