Court Cases

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 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 filed a lawsuit against an Aurora landlord after repeated threats to report tenants to immigration authorities. The court entered a preliminary injunction ordering the landlord not to threaten, harass, or retaliate our clients, including through disclosure of information about their immigration or citizenship status. The landlord then petitioned for bankruptcy, and the ACLU case is stayed in state court while that proceeding progresses. The preliminary injunction remains in full force and effect.

In a lawsuit brought against Colorado and Denver by the federal government, the ACLU of Colorado filed an amicus brief defending state and local laws that limit the diversion of their resources for the purpose of federal civil immigration enforcement. The brief argues that these laws are good policy, as they protect public safety and the functioning of state government, keep state actors within constitutional bounds, and promote the overall well-being of our communities and economy.

We filed an amicus brief arguing that there is no Free Exercise Clause violation when a governmental body conditions a public benefit on a religion-neutral and generally applicable requirement.

The ACLU of Colorado filed an amicus brief with Spero Justice and Office of the Alternate Defense Counsel arguing that Colorado’s habitual sentencing scheme is unconstitutional.

The 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 ACLU of Colorado joined civil rights groups and religious organizations to file an Amicus Brief arguing that there is no Free Exercise Clause violation when a governmental body conditions a public benefit on a religion-neutral and generally applicable requirement.

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.