The US does <i>not</i> have a general right to privacy; the 4th amendment is very limited, and does not apply to information held by third parties.<p>4th amendment litigation is full of really questionable reasons for &quot;probable cause&quot; for warrantless searches, and then there&#x27;s things like the FBI fake base stations and the NSA listening programme.<p>The EU has a general right to privacy .. with a law enforcement exception.