The proposed bill establishes a new chapter in Title 43 RCW focused on federal immigration enforcement, emphasizing the state's commitment to protecting immigrant communities while cooperating with federal authorities. It includes definitions for key terms such as "federal immigration agency," "immigration detainer," and "sanctuary policy." The bill prohibits state entities and local governmental entities from adopting sanctuary policies that impede cooperation with federal immigration agencies. It mandates that law enforcement agencies use their best efforts to support federal immigration law enforcement and outlines specific duties related to immigration detainers, including notifying judges and recording detainer information.

Additionally, the bill repeals several existing laws related to immigration enforcement, effectively nullifying any sanctuary policies currently in place. It requires counties to enter agreements with federal immigration agencies for housing individuals subject to immigration detainers and establishes enforcement mechanisms for violations of the new regulations. The bill also includes provisions to protect victims and witnesses of crimes from being detained solely based on their immigration status and prohibits discrimination based on gender, race, religion, national origin, or physical disability in the enforcement of these laws.