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Geofence and Keyword Searches: Reverse Warrants and the Fourth Amendment

Published Feb 10, 2026Updated Feb 12, 2026

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

Geofence and Keyword Searches: Reverse Warrants and the Fourth Amendment — Informed