Because someone thought they weren't.
QUOTE
But the unanimous 9-0 ruling goes against law enforcement agencies including the U.S. Department of Justice, which wanted more latitude to search without having to obtain a warrant.
Transparency. And they totally want to cut down on the number of phones they're tapping into, see? They went to all the trouble of going through the Supreme Court to make it happen.
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Diogenes of Sinope:
"It is not that I am mad, it is only that my head is different from yours."
"Other dogs bite only their enemies, whereas I bite also my friends in order to save them."
Arnold Judas Rimmer, BSC, SSC:
"Better dead than smeg."