Jail411 archive report
Published March 6, 2026 · Updated March 22, 2026
A former state prison in Kern County has been converted into one of the largest immigration detention centers in California, holding roughly 1,400 detainees under a contract with CoreCivic, the private prison giant. The facility represents the most visible expansion of ICE detention infrastructure in the state since the current federal administration took office.
The Department of Homeland Security says there are approximately 33,000 people it classifies as "criminal aliens" currently in California custody — a figure the agency has used to justify the rapid buildout of detention capacity. U.S. Senators Alex Padilla and Adam Schiff visited the Kern County facility in recent weeks, though neither has publicly detailed what they observed inside.
The conversion of a state prison into a federal immigration detention center underscores a shift in how California's correctional infrastructure is being repurposed. As the state closes prisons due to declining populations, the federal government is stepping in to fill the empty beds with a different population entirely.
The Numbers Behind the Rhetoric
DHS has released data showing that 4,561 people were released from California custody since January 20 despite active ICE detainers requesting they be held for transfer. Among those released, the agency says, were individuals with charges or convictions including 31 homicides, 661 assaults, and 234 sex offenses.
Those numbers have become a flashpoint in the ongoing conflict between federal immigration enforcement and California's sanctuary policies. But the picture is more complicated than either side presents. The governor's office says California cooperates fully on releases from state prisons, flagging people with ICE detainers well in advance of their release dates. The problem, according to state officials, is that ICE fails to collect roughly one in eight people the state identifies — meaning the federal agency itself is not picking up detainees it has requested.
Understanding the distinction between jails and prisons is critical here. State prisons, which hold people serving longer sentences, have predictable release dates that allow coordination with ICE. County jails, where people cycle through on short stays and unpredictable bail situations, are where most of the friction occurs. California law restricts county jails from holding people past their release date solely on an ICE detainer, which the federal government treats as a refusal to cooperate.
CoreCivic and Private Detention
The Kern County facility is operated by CoreCivic, one of two publicly traded companies that dominate the private detention industry. CoreCivic reported significant revenue growth in its most recent earnings call, driven largely by new federal immigration contracts. The company operates detention beds across multiple states but has faced persistent criticism over conditions, medical care, and use-of-force incidents at its facilities.
For families trying to visit someone held in ICE detention, the process is substantially different from visiting a state or county facility. ICE detention centers operate under their own visitation rules, which vary by facility and contractor. Legal advocates report that detainees at the Kern County site have faced difficulties accessing attorneys, particularly those transferred from other parts of the state who arrive without their legal documents.
The 1,400 detainees at the Kern County center represent a fraction of the total ICE detention population in California. Facilities in Adelanto, Imperial County, and other locations continue to hold thousands more. Anyone attempting to locate someone in ICE custody can use the agency's online detainee locator system, though advocates warn the database is frequently out of date, particularly during periods of high transfer volume.
A State Divided
California finds itself in an increasingly contradictory position. The state is closing its own prisons, investing in rehabilitation, and reducing its incarcerated population. At the same time, federal authorities are filling that vacuum with immigration detainees held in facilities run by private companies, often under conditions that fall below state standards.
The Padilla and Schiff visit signals that congressional Democrats are paying attention, but federal legislation restricting detention expansion faces steep odds in the current political environment. For now, the buildout continues, and Kern County — already home to some of the state's most remote correctional facilities — has become the epicenter of California's immigration detention expansion.
How long the current pace of expansion continues depends on factors largely outside California's control: federal enforcement priorities, court rulings on detainer policies, and the outcome of the next election cycle. What is clear is that the infrastructure is being built to last.