Immigration Detainer Enforcement Act of 2024

S 3923 requires state and local law enforcement to hold criminal aliens for up to 48 hours to transfer to U.S. Immigration and Customs Enforcement (ICE), if ICE issues a detainer. It mandates that states cannot restrict sharing immigration status information with ICE and prohibits local agencies from blocking detainer compliance. The bill also creates a federal compensation program, funding states $750 million in 2025 (rising to $950 million annually through 2031) for detaining eligible criminal aliens - defined as those convicted of felonies or multiple misdemeanors who entered without inspection or violated visa status. States must comply with detainer requests to receive funding, with non-compliant jurisdictions losing eligibility.