Electronic Frontier Foundation has this up.
The internet should be viewed as a private transaction between the user and the internet. I don’t understand the thought that because you’re on the ‘net, you’re automatically abdicating the Right to Privacy guaranteed by the Fourth Amendment.
Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
~~~~~~~~~