https://cdt.org/insight/section-702-what-it-is-how-it-works/ Section 702 of FISA - FISA is supposed to apply to non-Americans, but section 702 allows the FBI to search evidence without a search warrant of Americans - "Backdoor Search Loophole"
https://en.wikipedia.org/wiki/Foreign_Intelligence_Surveillance_Act_of_1978_Amendments_Act_of_2008 January 18, 2018: The Senate approved a six-year extension of Section 702 of the Foreign Intelligence Surveillance Act
https://cdt.org/ Center for Democracy and Technology