Much of this would be platform specific and not just ISP. If you're using burner phones, odds are you're using a VPN. Things like Facebook, AVOW, Twitter, etc...are going have more information as the the user's account.
How are they going to cross verify? It's not like they'll have access to the ISP's records because she tells them she has Spectrum, Cox, etc...I could say I made a post on Websleuths and I use Comcast...Ok? How are you going to verify that?
I'd without a doubt lawyer up if she hasn't already. I'm not saying she's innocent in all this, but this is a joke in my opinion. Do you know what law enforcement has to go through and provide to get warrants for even a fraction of what they're asking her to produce in 14 days? Good luck getting all 764 entities MM is requesting to even comply without probable cause showing the account contains evidence of a crime. As someone above stated, much of this he probably has already in the terabytes of data in his possession. What a clown
What are MG's legal options right now in regards to a response?
As one example, logging into Facbook, on a burner phone or not, generates records on Facebook's side of things. Regardless of how I access it. I can say I don't have or cannot produce any records of when I accessed Facebook, but Facebook can try to produce something if subpoenaed. An ISP provider can show some websites that were accessed, when they were accessed, etc.
I used the word "cross-verify" and you may have misinterpreted it, it doesn't mean solely, in my opinion, that Melanie produces something and ____ produces something else and you verify if they match. In my opinion it can also be, Melanie produces nothing and _____ produces electronic records....."verified" IMO. Sorry, I did not have a better term to describe what I was trying to.
She has numerous options to responding to a subpoena, like everyone else does, she can:
-try to comply and produce as many records in relation to what is written on the subpoena
-comply and produce some records while claiming some specific records are privileged or contain privileged information
-comply and produce some records while claiming some specific records are confidential and/or contain confidential information
-object to some or all specific records because they are (confidential, privileged, unable to access, etc, etc, etc)
-object to producing some or all of the records requested because there is not enough time, the burden to do so is too high and unreasonable, the subpoena is too vague or ambiguous, etc....
-completely ignore the subpoena and produce nothing
The options are not an infinite but there are many; you can combine/remove/change out some of terms (privileged info, confidential info, etc) with just some of the scenarios and you can start to see the multitude of options..... It will be interesting to see what she does in a little less than a week