IMMIGRATION COOPERATION AND ENFORCEMENT ACT – Adds to existing law to provide for cooperation with federal authorities, to provide for cooperation with immigration detainers, to provide for the crime of unlawful presence of a dangerous illegal alien, and to provide for the crime of smuggling a dangerous illegal alien.

Idaho's S 1039, the Immigration Cooperation and Enforcement Act, requires state law enforcement and correctional facilities to cooperate with federal immigration authorities regarding individuals deemed "dangerous illegal aliens" (those with prior convictions for serious crimes like assault, murder, or drug trafficking). It mandates honoring immigration detainers (federal requests to hold individuals) without undue burden and creates two new offenses: "unlawful presence" (misdemeanor for first offense, felony for repeat) and "smuggling a dangerous illegal alien" (felony). The law imposes penalties including up to 2 years in prison and $10,000 fines for violations, while exempting victims of domestic violence or sexual assault from enforcement. This directly affects Idaho law enforcement agencies, correctional facilities, and undocumented immigrants with prior serious criminal convictions.