Assembly Bill 739 aims to prohibit state and local government officials, including law enforcement officers, from assisting in the detention of individuals solely based on their immigration status. Specifically, the bill states that no official, employee, or agent of a state agency or local governmental unit may aid in such detentions. However, it allows for access to facilities as required by a properly executed judicial warrant. This provision is intended to protect individuals from being detained solely due to their immigration status.

Additionally, the bill prohibits state agencies and local governmental units from entering into or continuing existing agreements with the federal government under section 287(g) of the federal Immigration and Nationality Act, which allows for certain immigration enforcement activities to be performed by state and local officials. This change reflects a significant shift in how Wisconsin intends to handle immigration enforcement at the state and local levels, emphasizing a separation from federal immigration enforcement practices.