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thare some points that the federal government can access without needing any permission such as a warrant (some of these need a subpoena, which is way easier to obtain than a warrant),my part regarding to this topic is (Ip address) and it is controversial essay just showing the facts. http://arstechnica.com/tech-policy/2012/12/no-warrant-no-problem-how-the-government-can-still-get-your-digital-data/