In 2019, Xiaoman Ding was diagnosed with a pituitary tumor in her brain that caused her debilitating headaches. At times, she couldn’t open her eyes or walk.

So while she was detained at the Adelanto ICE Processing Center after being arrested at an immigration courthouse in Santa Ana last June, she made repeated requests for medical treatment. Instead of getting the normal medications she took to manage her symptoms, she said she received Tylenol and ibuprofen.

By July, her pain became so “unbearable” she told a nurse at the detention center she wanted to take her own life. The facility placed her in solitary confinement for three days for monitoring.

“I never told anyone that I experienced suicidal thoughts again,” she said in court documents that form part of a federal lawsuit filed in January by a private law firm and immigrant right' group seeking to improve conditions at the facility. “I was afraid that I would be put into solitary confinement.”

The case continues to make its way through the court system. The next hearing is scheduled for late May.

In declarations accompanying the lawsuit, detainees shared their experiences in isolation. Many of them said they were placed in solitary confinement after asking for things that are essential for their dignity — or to fight their case in court. Others said the confinement made them reluctant to ask for help in the future.

How detention centers isolate detainees

About 2,000 immigrants are currently being held at the ICE detention center in Adelanto. The site is run by The GEO Group, a private prison operator.

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Chris Carlson

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Across the country, immigrant detention centers like Adelanto are holding more people in solitary confinement than under previous administrations — including President Donald Trump’s first term. Immigration and Customs Enforcement data also shows that detainees are being isolated for longer periods of time, and experts say solitary confinement can worsen the conditions of people who need support.

People in custody can be placed in “segregation,” as it is dubbed at these centers, for numerous reasons. These can include disciplinary issues, as well as claims by facility officials that the move is needed to protect detainees who could be harmed if left among the general population. People in detention can also be put in segregation if they are on suicide watch, if they’re experiencing a “serious mental or medical illness” or for staging a hunger strike.

Detainee advocates say isolation is also being used to punish immigrants in civil detention.

The “threshold to use solitary is often quite low and arbitrary,” said Katherine Peeler, an assistant pediatrics professor at Harvard Medical School and medical advisor with Physicians for Human Rights. The nonprofit publishes reports on solitary confinement at immigrant detention centers, rooted in public records, ICE data and testimony from detainees.

Some 2,000 immigrants are currently held at the Adelanto detention center, about 90 miles northeast of downtown L.A. in San Bernardino County. An LAist analysis of the most recent ICE data found that, ranked by percentage of the detainee population in segregation, this site is among the top 10 facilities in the United States.

How segregation can make medical issues worse

To get a sense of what immigrant detainees experience in segregation, Peeler asks the public to envision confinement.

“You are contained in a small cell, usually the size of a parking space,” she said. “Imagine being in a parking space and enclosing it all the way . . . You can't get out. You can't change the temperature.”

“The inability to control your environment, as well as the lack of contact with other humans, is known in medical literature to lead to great deals of anxiety, depression [and] extreme loneliness,” Peeler added. “People have been known to have hallucinations and agitation, [as well as] reduced cognitive functioning.”

The most recent Physicians for Human Rights report found that, between April 2024 and May 2025, ICE detention centers placed over 10,500 people in solitary confinement — often for more than 15 days. UN human rights experts consider solitary confinement placements that last that much or more to be torture, though the Supreme Court has held that isolation doesn’t violate the Constitution. ICE’s own policies call for “additional steps to ensure appropriate review and oversight of decisions to retain detainees in segregated housing for over 14 days.”

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At least four people have died after being held in custody at an ICE detention facility in Adelanto, California. A recent lawsuit alleges that living conditions there are inhumane, and some compare the facility to "concentration camps."

Rotten food, disease, isolation. What we know about conditions at the Adelanto ICE detention center

At least four people have died after being held in custody at an ICE detention facility in Adelanto, California. A recent lawsuit alleges that living conditions there are inhumane, and some compare the facility to "concentration camps."

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Disability Rights California, a federally mandated nonprofit that advocates for people with disabilities in the state, monitors conditions at immigrant detention centers.

Richard Diaz, a senior attorney at the nonprofit, was part of a team that conducted a site visit at Adelanto last summer. The team found a general lack of accommodations for people with disabilities. Diaz also spoke with a detainee who’d been placed in solitary confinement for over a month. “On top of that,” he told LAist, the detainee “had medical concerns and accommodation needs that weren't being met.”

Peeler noted that solitary confinement is also associated with sleep disruption, which “can lead to further mental health issues.”

Sleep disruption “is also really bad for one's stress response system,” she added. “You can have heightened levels of the stress hormone cortisol. This can lead to problems with hypertension or high blood pressure, and general underlying medical conditions being worsened.”

The federal government denies claims of substandard conditions at immigrant detention centers and declined LAist’s requests for interviews and comments. In statements issued after the recent deaths of detainees, ICE said it is “committed to ensuring that all those in custody reside in safe, secure and humane environments."

In a statement, a spokesperson for the GEO Group, a private prison operator that runs the Adelanto detention center, said: “[O]ur support services are monitored by ICE, including by on-site agency personnel, and other organizations within the Department of Homeland Security to ensure compliance with ICE’s detention standards and contract requirements regarding the treatment and services ICE detainees receive. In the event issues are identified, we quickly resolve all of ICE’s concerns.”

“The support services GEO provides include around-the-clock access to medical care, in-person and virtual legal and family visitation, general and legal library access, translation services, dietician-approved meals, religious and specialty diets, recreational amenities, and opportunities to practice their religious beliefs,” the spokesperson added.

What detainees have to say

People held at Adelanto paint a different picture.

LAist reviewed the detainee declarations filed as part of the January federal lawsuit seeking to improve conditions at the facility. Aside from people experiencing mental health crises and medical issues, multiple detainees at Adelanto described being placed in segregation as a form of punishment.

Andrei Karamychev is a Russian immigrant who came to the U.S. in 1999. In his testimony, Karamychev said that, after arriving at Adelanto last summer, he did not hear anything about his case for two months, “despite asking repeatedly to get information.”

“Many other people in my unit were also upset about not being told the reason for their detention,” he said. “We worked together to get attention to this issue by all yelling together, demanding to see our ICE officers.”

Eventually, Karamychev said, “a bunch of guards showed up and began to take out the people that spoke up, one by one.”

Six of the detainees involved were put in solitary confinement. After a few days in isolation, Karamychev said, “a lieutenant came in to meet with me and told me that I was going to spend two months in solitary because I had fought the officers.”

“This was a lie. I told him that I did not fight the officers, [that] I had just demanded nonviolently to see an ICE officer about my case,” Karamychev said. In response, the lieutenant told him: "We choose our truth."

Karamychev further detailed his confinement: “In solitary, I was under lockdown for about 23.5 hours a day. We had 30 minutes each day outside of our cells. During those thirty minutes, we could go outside for yard time in a cage that is about 10 feet by 10 feet, walk to the microwave to reheat meals, or look at a book.”

“When you are brought out to the mini yard, you are locked out there until the guards decide to let you back in,” he added. “The yard smells like urine because people had to pee out there, and it was not cleaned up. It is difficult because you want to have fresh air, but it smells like urine.”

Julius Omene Frederick, an immigrant from Nigeria, was taken to Adelanto in January 2025. He has an ongoing application for a U visa, which is intended to give temporary immigration status to crime victims who have cooperated with law enforcement.

According to Frederick, his unit had six showers for 80 people.

“There are three showers on each side of the room, with a walkway in the middle,” he said. “There are no privacy screens or curtains.”

Frederick said he asked Adelanto guards for curtains “to give us some privacy.” Instead, he was placed in solitary confinement for seven days.

On another occasion, Frederick said he was put in isolation for six days after complaining about the lack of access to the law library. Adelanto only allows four people from each 80-person unit to attend the library per day, he said. By Frederick’s estimation, the library can fit “20 to 15 people.”

“We need access to the library so we can work on our immigration cases,” he explained. “Many of us do not have lawyers, so it is a real problem.”

Saddam Samaan Daoud Samaan, an immigrant from Jordan who had been living in Minnesota for nearly two decades before he was detained, said he was also put in solitary confinement after advocating for more access to the law library.

Throughout the detention center, Adelanto staff have put up posters about “voluntary departure,” Samaan added.

“The posters say that some people will be eligible for over $2,000 and a free flight if they choose to self-deport,” he said. “They even have sign-up sheets where you can write your name down to tell ICE you want to ‘voluntarily depart.’ I've seen them in the dayroom, the chow hall, and the solitary confinement unit. And it works. Being here breaks people.”

When detainees first arrive at Adelanto, they usually tell Samaan “they have support from their family and [and] plan to stick it out here as long as it takes.”

“Then, a month later,” he added, “they decide to sign away their case and leave the U.S. rather than stay at Adelanto any longer.”