RockyTop85
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I think the first paragraph is correct.I am assuming with letters, and possible texts and emails, those would require a warrant to obtain.
and as a lay person the general difference seems to be that a subpoena requires the subject to provide specific "information", while a warrant allows the government to go seize whatever is covered.
Tennessee has a statute (40-17-123) that covers these subpoenas. They have to be issued by a judge and there is a quantum of suspicion requirement (reasonable basis, which is vague).
Very brief search for the 6th circuit and Tennessee cases for use of that statute to obtain text messages turned up a small number of cases and nothing really on point. Usually that’s a sign that law enforcement just knows better.
I think the subpoena and warrant work basically the same way, it’s just a matter of what it can be used for. The more invasive the search or the more inherently private/protected the information tends towards needing a warrant. In this case, because it’s being obtained from a third party, it is less invasive and because it doesn’t involve the contents of communications it was arguably not protected.