By law, all activities conducted under the Foreign Intelligence Surveillance Act must be consistent with the Fourth Amendment to the U.S. Constitution.
Notes on verification
Multiple independent legislative sources (CRS, bill text, Congress.gov) confirm specific FISA provisions require consistency with the Fourth Amendment, but the claim's generalization to 'all activities' is broader than the cited provisions, which pertain to specific procedures like targeting and querying under Section 702. [tier=bronze indep_score=0.539 clusters=2 claim_tier=notable]
Sources
- National Security Agency/Central Security Service > Signals ... (seed:military_and_intelligence)
- https://www.congress.gov/crs-product/IF11451 (corroboration)
- https://www.govinfo.gov/content/pkg/BILLS-110hr6304pcs/html/BILLS-110hr6304pcs.htm (corroboration)
- https://www.congress.gov/bill/110th-congress/house-bill/6304 (corroboration)