According to the report, released Tuesday by the King County Auditor’s Office, the sheriff’s office shared unredacted case files with ICE approximately 25 times between January 2018 and May 2019. The sheriff’s office did so without the required criminal judicial warrant.

In February 2018, partly in response to the Trump administration’s hard-line immigration policies, the King County Council adopted an ordinance prohibiting agencies from providing personal information to federal immigration authorities for civil immigration enforcement.

“This was an unfortunate error. We own the mistake. Once we learned of this, we immediately changed our procedures so this will not happen again,” said Sgt. Ryan Abbott of the King County’s Sheriff’s Office in response to questions about the report.

The report also found that ICE was able to look up the personal data of inmates through the Department of Adult and Juvenile Detention’s web portal, known as the Jail Inmate Lookup System — Law Enforcement. According to the report, the database contains confidential information, including photos, physical descriptions, addresses and up to 50 aliases for each person booked into King County jails.

Based on access logs, the King County Auditor’s Office estimates that at least 15 members of ICE’s Detention and Removal Unit logged into the Department of Adult and Juvenile Detention system more than 1,000 times between March 2018 and April 2019, providing them with access to the private information of thousands of individuals.

Officials with the Department of Adult and Juvenile Detention also failed to provide certain inmates with a copy of what is known as an ICE detainer or to inform them that they were being tracked by immigration enforcement agents.

In a July letter to the auditor’s office, King County Executive Dow Constantine noted that the Department of Adult and Juvenile Detention had deactivated all ICE accounts within a week of the auditor’s office informing the department of the federal agency’s access to the private information.

Constantine also said authorities had not collected information about inmates’ citizenship status or place of birth since June.

Constantine noted he knew of no instance in which the sensitive information was used to detain or deport someone.

The auditor's office report issued a number of recommendations for agencies throughout King County, noting that the county lacks a clear and consistent way of determining what counts as sensitive, personal information.

The county also should develop a system for identifying personal information that requires additional safeguards, the report said.

Update: On Thursday, the King County’s Sheriff’s Office said requests from ICE, Border Patrol and the Department of Homeland Security would from now on be subject to a two-part review by a Record Specialist team lead and the Records Unit Manager.