Import Security and Fairness Act

This bill amends the Tariff Act of 1930 to restrict duty-free entry for low-value shipments (under $800) from specific countries. It directly affects importers of such goods originating from nonmarket economy countries or those on the U.S. Trade Act's priority watch list, requiring them to submit detailed documentation including origin, value, shipper, and importer information. The bill imposes $5,000 civil penalties for false submissions and adds procedures for handling detained merchandise, including 30-day response windows for importers. It becomes effective 180 days after enactment.