“”If Russian hackers can be convicted on evidence obtained by the Americans through hacking, it means the U.S. secret services may use further illegal means of obtaining information in Russia and in other countries,” an FSB spokesman told Interfax on Thursday.”

— The Moscow Times
Good point.
Apparently search warrants are only necessary when dealing with God-fearing American citizens, as opposed to those heathen fer’ners.
(Unless of course you’re a member of the RIAA, in which case you can do whatever the hell you please, without being held responsible.)