The bill introduces a new chapter, Chapter 169, titled "Detention for Federal Civil Immigration Violations," to Title 42 of the General Laws. It prohibits state and municipal government officials or bodies, or any agency or instrumentality thereof, from entering into, renewing, or agreeing to any contracts or agreements that would be used to detain individuals for federal civil immigration violations. This prohibition includes intergovernmental services agreements and any leases or agreements that facilitate the use of public real property for such detentions.

Additionally, any state or municipal governmental official or body that is a party to any existing agreement for this purpose must exercise the termination provision of that agreement and cease its use for detaining individuals for federal civil immigration violations no later than July 1, 2026.

The bill also includes a severability clause, stating that if any clause, sentence, paragraph, section, or part of this chapter is adjudged by a court of competent jurisdiction to be unconstitutional or otherwise invalid, that judgment shall not affect, impair, or invalidate the remainder of the chapter.

The act is set to take effect immediately upon passage. Overall, the legislation aims to restrict the involvement of state and local governments in federal immigration enforcement activities.