The proposed bill establishes a new chapter in Title 43 RCW focused on federal immigration enforcement, emphasizing the importance of cooperation between state and federal authorities. It defines key terms such as "federal immigration agency," "immigration detainer," and "sanctuary policy," and explicitly prohibits state entities, law enforcement agencies, and local governmental entities from adopting sanctuary policies that impede compliance with federal immigration laws. The bill mandates that law enforcement agencies use their best efforts to support federal immigration enforcement and outlines specific duties related to immigration detainers, including notifying judges and maintaining records.

Additionally, the bill repeals several existing laws related to immigration enforcement, which are deemed inconsistent with the new provisions. It includes measures for the reimbursement of costs associated with housing individuals subject to immigration detainers and establishes enforcement mechanisms for violations of the chapter. The bill also prohibits discrimination based on gender, race, religion, national origin, or physical disability in the enforcement of its provisions. Overall, the legislation aims to strengthen the collaboration between state and federal immigration authorities while eliminating policies that may obstruct this cooperation.