Earlier quoted context omitted.
> A search involves compulsion. Exclusively? That's a novel interpretation of 4A. Where did you get it?
I get the impression that a majority of the commenters here are (somehow) not aware that there is a deep body of legal precedent interpreting 4A.
I don't think there's any landmark decision contrary to the interpretation of 4A that I'm putting forth.
As it stands now, the interpretation I am putting forth is the one the government abides by - it can buy data from brokers without warrant if there is no compulsion.