I very much doubt most agencies and independents encrypt or properly delete. Most will think deleting is all that needs to be done to "disappear" the info. But even if they do encrypt whatever they use for storage on their laptop, phone or tablet it might not make any difference.
How many of us have sent screening info or setup a meet in a situation where either party was using one of the free webmail accounts such as Yahoo, Gmail, ... These companies make money by gathering massive amounts of data. Just because a user deletes an email out of their inbox and then deletes their trash folder doesn't mean that data is gone, the company will keep that data and use it in accordance with their policies. Just as an example I spent about five minutes researching Yahoo and found this in the privacy policy sub-section of their terms of service at https://policies.yahoo.com/us/en/yahoo/privacy/index.htm
"Yahoo collects information about your transactions with us and with some of our business partners, including information about your use of financial products and services that we offer. Yahoo analyzes and stores all communications content, including email content from incoming and outgoing email." Then further down in the PP "Yahoo does not rent, sell, or share personal information about you with other people or non-affiliated companies except to provide products or services you've requested, when we have your permission, or under the following circumstances: ... We respond to subpoenas, court orders, or legal process (such as law enforcement requests), or to establish or exercise our legal rights or defend against legal claims."
Further, in the ToS Yahoo is very clear that anyone using their services agrees and understands that anything you transmit will cross state and international boundaries even if you're emailing a friend across the street, and that the information could very well end up in a jurisdiction that has privacy laws more lax than where you reside.
Nowhere in the ToS or PP could I find anything saying that when a user deletes information it is "gone for good", and that makes me believe that it will be up there in the cloud swirling around forever.
I understand that it may not be easy for LE to link an email account with fictitious information to the person using that account.
It's an interesting discussion.
-- Modified on 3/2/2017 7:53:14 PM