A federal judge ruled on Tuesday that immigration agents in Colorado may only arrest illegal immigrants without a warrant if the targets are likely to flee.

A federal judge ruled Tuesday that immigration officers in Colorado can only arrest people without a warrant if they think those people are likely to flee. U.S. District Senior Judge R. Brooke Jackson issued the order in a legal challenge brought by the American Civil Liberties Union of Colorado and other lawyers. The lawsuit accuses immigration officers of indiscriminately arresting Latinos to meet enforcement goals without evaluating what’s required to legally detain them.

A federal judge has ruled that immigration officers in Colorado can only arrest people without a warrant if they think those people are likely to flee.