A federal judge just delivered one of the sharpest legal blows to ICE enforcement in Colorado. The court found agents repeatedly violated a standing court order by arresting people without checking if they were actually a flight risk or undocumented. Behind this ruling is the story of a college student, a construction worker, and a system that seemingly ignored a judge’s direct command.

A Court Order ICE Simply Ignored

On May 12, 2026, U.S. District Senior Judge R. Brooke Jackson issued a sweeping 60-page order with a clear verdict. He found that ICE had “materially violated” the preliminary injunction he put in place back in November 2025. That original injunction barred ICE from making warrantless arrests in Colorado unless agents first determined, on an individual basis, that the person was both in the country illegally and likely to escape before a warrant could be obtained. Under federal law, both conditions must be met before a warrantless immigration arrest is legal. That is not a new rule. It has been on the books for decades. But the judge found ICE agents were simply not following it. The documentation failures alone were damning. > “The PI could not have been clearer: for every warrantless arrest, the arresting officer must document in the I-213 (arrest report) that the arrest was executed without a warrant. Despite this, not one of the 36 I-213s that have been produced pursuant to the PI Order complies with this mandate.” > Judge R. Brooke Jackson, May 12, 2026 Zero out of 36 arrest reports met the legal standard. Not one. The judge noted the reports contained no mention of flight risk, no articulable facts about why the person might escape, and no documentation of community ties. Jackson also ordered ICE to pay attorneys’ fees for the lawyers representing the affected immigrants and to hand over more arrest records to those legal teams going forward.

The Stories Behind the Lawsuit

This case did not start in a courtroom. It started on a highway. On June 5, 2025, 20-year-old Caroline Dias Goncalves was driving on Interstate 70 near Loma, Colorado when a Mesa County sheriff’s deputy pulled her over for following a semi-truck too closely. The stop lasted less than 20 minutes. The deputy released her with a warning. She never made it far down the road. A Mesa County deputy had shared her personal information, including her origin and vehicle details, in a Signal group chat that included federal immigration agents. Those agents tracked her down immediately after she exited the highway and placed her under arrest without showing a warrant. She was taken to the Aurora ICE detention facility, where she spent 15 days. Goncalves had no criminal history. She had lived in the United States since she was seven years old and was enrolled as a student at the University of Utah at the time of her arrest. Born in Brazil, she came to the U.S. with her family in 2012 on a tourist visa and has a pending asylum case. The case triggered serious consequences at the Mesa County Sheriff’s Office. Five deputies were disciplined as a result of the incident, and the Colorado Attorney General filed a lawsuit against Deputy Alexander Zwinck, who conducted the stop, for allegedly violating state law by coordinating with federal immigration agents. Goncalves was not alone in this lawsuit. Here are the other key plaintiffs:

• Refugio Ramirez Ovando: A 43-year-old lawful permanent resident who was arrested on his way to work in Grand Junction in May 2025. ICE later admitted they were looking for someone else entirely.
• Dionisio Castillo: A 53-year-old construction worker arrested at his job site in January 2026 while ICE was looking for a different person. He has lived in the U.S. for 30 years, has no criminal record, and has three American-born children. He spent 48 days at the Aurora detention facility, and his family paid $2,500 to secure his release.

These are not abstract legal cases. These are real people whose lives were disrupted, in some cases for weeks, without agents ever verifying basic facts about them before making an arrest.

ICE Agents Who Could Not Answer Basic Questions

At a court hearing in March 2026, the depth of the problem became impossible to ignore. Three ICE deportation officers testified before Judge Jackson, permitted to do so without revealing their full names. What they revealed was alarming. The officers, who had between six and twelve years of experience at the agency, struggled to explain what had changed in their arrest procedures after the November injunction. The judge concluded their understanding was “shallow” and gave him “no confidence” that they knew their legal responsibilities. One officer, identified only by his initials, told the court that as soon as someone claimed to be in the U.S. illegally, he arrested them immediately. He also said asking more questions would increase the chance of the person trying to escape. That reasoning directly contradicts federal law and the court’s order. At the same time, a memo issued by Acting ICE Director Todd Lyons in January 2026 contained guidance that conflicted with Jackson’s injunction. That internal mixed messaging created confusion among agents who were already under-trained and overwhelmed with a rapidly expanding operation. The Denver ICE office had hired dozens of new officers recently and was making 15 to 25 arrests per day, even as training hours were being cut. More arrests, less training, and conflicting guidance from Washington added up to widespread legal violations on the ground.

What the Ruling Means Going Forward

Judge Jackson’s May 12 order comes with real teeth. Here is what ICE must now do under the ruling:

The judge also clarified a practice ICE had been using to sidestep the rules. Some agents were obtaining so-called “field warrants” after they had already detained someone, essentially using a post-arrest document to make an unlawful arrest look legal. Jackson rejected that approach directly. He wrote that if ICE could shield every arrest by simply writing “field warrant” on a report regardless of when it was actually issued, the court’s injunction would be rendered meaningless. ICE has appealed Jackson’s original November injunction and did not immediately respond to the latest ruling. The government’s own attorney at the hearing did not deny that improper arrests had occurred, but argued the errors were early and limited to certain personnel. The ACLU of Colorado, which helped bring the case alongside the Meyer Law Office and Olson Grimsley Kawanabe Hinchcliff and Murray LLC, welcomed the decision. ACLU of Colorado legal director Tim Macdonald called it “a profoundly important decision for the rule of law and the people of Colorado,” adding that the court made clear ICE “cannot continue to violate the law.” Colorado Sen. John Hickenlooper called the ruling a major rebuke to the agency, crediting Goncalves’ courage in coming forward as a key force behind the legal push that led to both the retraining mandate and the curbing of unlawful arrests in Colorado. He called on Republicans to join Democrats in reining in ICE and working toward broader immigration reform. This is not an isolated battle. In the past year, federal judges in Oregon, California, and Washington D.C. have all issued similar orders restricting ICE from conducting warrantless arrests without first establishing a risk of escape. Colorado is now part of a growing national pattern of courts pushing back on immigration enforcement practices under the Trump administration. ICE arrested approximately 4,160 people in Colorado in 2025, a staggering 281 percent increase compared to 1,091 arrests in 2024. That scale of enforcement, without a matching scale of proper training and legal compliance, is exactly what put this case before a federal judge. The ruling reminds every American, documented or not, that constitutional protections do not disappear when immigration agents show up at a traffic stop, a construction site, or a commute to work. What happened to Caroline Dias Goncalves, Dionisio Castillo, and Refugio Ramirez Ovando was not just an administrative error. It was a failure of the most basic legal standard that governs how the government can take away a person’s freedom. A federal judge made that clear in writing, and now ICE must reckon with it. What do you think about this federal court ruling against ICE in Colorado? Share your thoughts in the comments below.