Earlier quoted context omitted.
If what you mean to argue is that this data gathering needed to be done under court supervision, well, it was. A subpoena is the type of court supervision process that is applicable in this case. What the subpoena means is that an attorney got a court order compelling a party to provide evidence. Warrants are also issued by the courts, but they do something different: They permit law enforcement officials (not attorn…
I haven't bothered to verify the claim but the article states: "a law called the Stored Communications Act allows authorities to seek data like this without a search warrant"
Turns out that before the Stored Communications Act, the existing law gave people essentially zero right to privacy with respect to electronic communications that were stored by a third party. The pre-existing law was basically just the 4th amendment, and traditionally you relinquish your 4th amendment protections for any documents that you give away.
What the SCA did was to create some hurdles that had to be jumped over to acquire this data. They're not quite as strong as the requirements one needs to get to obtain a search warrant or anything like that, but they're a heck of a lot stronger than what existed beforehand.
So the SCA did not, in fact, allow authorities to "seek data like this without a search warrant." Much the opposite, really.