Court Cases

The ACLU of Colorado filed a class action lawsuit seeking a declaration that state of Colorado officials are illegally confining hundreds of children in dangerous detention facilities instead of providing them with community services.

The ACLU of Colorado sent a letter to the City of Westminster regarding its likely unconstitutional ordinance limiting solicitation on public streets and intersections.

This case concerns the Colorado Springs Police Department’s use of unconstitutional warrants to comb through activists’ digital data in retaliation for their political speech and association.

The ACLU of Colorado filed a class-action lawsuit against the Trump administration to enjoin ICE from conducting warrantless arrests in Colorado without probable cause that the person is a flight risk and in the country without proper legal documentation. On November 25, 2025, a federal judge found ICE had unlawfully arrested each of the named plaintiffs, certified a class of similarly situated individuals, and enjoined ICE from arresting anyone in Colorado without a warrant without first making the probable cause findings required by law.

The ACLU of Colorado filed an amicus brief in support of a class action lawsuit brought by incarcerated Coloradans alleging the state is violating the voter-approved constitutional amendment banning slavery in all instances—including for those convicted of crimes.

The ACLU of Colorado filed a class action lawsuit in federal court seeking to declare that ICE and DHS’s new practice of denying release on bond to groups of noncitizens violates federal law.

The ACLU of Colorado sued the Elizabeth School District because it banned and removed at least 19 books from school libraries based on the school board’s disagreement with the ideas they contain. The plaintiffs include students who have a right to access those books.

The ACLU of Colorado filed an Amicus Brief seeking to provide the Court with Colorado-specific context that counsels strongly against eroding the protection provided by a second competency evaluation by an evaluator of the raising party’s choice.

ACLU of Colorado filed a lawsuit against ICE to obtain additional records regarding the agency’s ramp-up plans to expand immigration detention across Colorado and Wyoming. The government has since produced heavily redacted documents revealing some new information about ICE's plans.