"U.S. Surveillance Through Bulk Metadata Collection: Exploiting the Weakness of Fourth Amendment Jurisprudence"

So what I don't actually find here is the matter that would respond to my objection: what's the constitutional basis for altering any of the doctrine—from the distinction between telephone call content and call connection data, that between data left with third parties in the course of market transactions for goods or services and that maintained by the person herself, that between circumstances of prosecution and circumstances of non-prosecutorial investigation—that is admittedly reducing the Fourth Amendment's relative scope of influence? Don't the words mean substantially what they always have meant? In which ways has what was always reasonable become unreasonable?