2013 年的文章，U.S. Authorities Can Access Non-Citizen iCloud Data Without A Warrant https://www.cultofmac.com/213301/u-s-authorities-can-access-non-citizen-icloud-data-without-a-warrant/
The Foreign Intelligence Surveillance Act (FISA) allows the U.S. government open access to electronic information stored by non-US citizens on US-based servers, like a host of cloud services available today. iCloud, Google Drive, Dropbox, and other popular services are all subject to this law, passed in 2008 by the Bush administration and recently re-authorized by the Obama administration for another 5 years.
What this means is that any data stored by non-American citizens on cloud servers here in the US is able to be looked at in entirety by various agencies in the US federal government, including the NSA, FBI, and CIA.
Caspar Bowden, Chief Privacy Adviser to Microsoft Europe for nine years until 2011, told UK-based The Independent: “What this legislation means is that the US has been able to mine any foreign data in US Clouds since 2008, and nobody noticed.”