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Chicago’s Inspector General Finds the City’s Gang Database Is Riddled With Errors

The database has been accessed more than 1 million times, including some 32,000 times by immigration officials. Police said they will fix the database but not erase it.

Anadolu Agency via Getty Images

Gang data collected by the Chicago Police Department has been accessed more than 1 million times over the last decade by immigration officials, the FBI, the Chicago Public Schools and scores of other agencies.

Yet the Police Department has done little to make sure the information is accurate and has no clear rules for how it can used by those outside entities, according to a 159-page report released Thursday morning by the office of Joe Ferguson, Chicago’s inspector general.

The department’s failure to ensure the accuracy or fairness of its gang database, Ferguson concluded, has caused lasting damage. In lawsuits and at public hearings, dozens of people have reported being targeted by federal immigration enforcement or losing out on job opportunities after being wrongly included in the database.

And at a time of tension between police and many community residents, especially on the city’s South and West sides, the database “potentially undermines public confidence in the Department’s legitimacy and effectiveness in the service of its public safety mission,” the report says.

Police officials have promised for more than a year to clean up the data collection system and offer people listed as gang members the opportunity to appeal. As Ferguson’s office prepared to release its report, the department finally began to unveil those reforms. But it will not yield to demands from community and legal groups to erase the database altogether. Nor has it agreed to purge all historic records of gang membership, even those that might be inaccurate.

“Given the unique gang violence issues that have existed and evolved for generations in Chicago, maintaining gang information and intelligence is a vital part of CPD’s anti-violence efforts,” police Superintendent Eddie Johnson wrote in an April 5 letter to the inspector general’s office and released publicly Thursday.

Johnson wrote that police officials agreed with most of the report’s findings. The department is retooling its system, now called the Criminal Enterprise Database, he wrote. The department will create clearer standards, improve officer training, perform regular audits and implement an appeals process for those listed in the data.

Chicago Inspector General Joe Ferguson at a news conference Thursday discussing his report on the Police Department’s gang database. (Mick Dumke/ProPublica Illinois)

The Police Department has tracked gangs for more than a century, starting with paper files. For a time, it collected high school yearbooks to keep tabs on suspected gang members. Since 2009, though, it has used an often-messy combination of at least 18 different forms, data warehouses and computer platforms, according to the inspector general. The department’s lists of people deemed to be gang members are commonly referred to as its “gang database.”

These lists are riddled with errors, as I reported last year after acquiring a set of the data with 128,000 entries. They included 163 people supposedly in their 70s or 80s and 15 individuals older than 100.

The inspector general’s office found still more striking and questionable data. Over the last decade, more than 134,000 people were identified as gang members after being arrested, usually for misdemeanors or petty infractions. But in 11% of the entries, no gang was listed, even though those individuals were supposedly included in the database because of gang associations.

More than 900 people were listed with multiple genders, the inspector general found. Eighty people were recorded as 0 years old.

Thousands of people who weren’t arrested or accused of a crime were also identified as gang members, often on forms filled out by officers during street stops. Individuals could be entered into department data systems even though no one verified the identifications were correct or distinct from others with the same names.

The department “cannot confirm that all of its gang designations are accurate and up-to-date,” the inspector general’s report concludes. And it “may not be able to ensure that all gang-related data collection tools serve a legitimate law enforcement purpose and are used appropriately.”

More than 500 outside agencies can access the Police Department’s gang data — and the department couldn’t even provide the Inspector General’s Office with a full list. The department places no constraints on how the data is used except that it must be for “law enforcement purposes.”

Between 2009 and 2018, 337 outside agencies ran queries in the department’s gang identification tables, accounting for more than a third of all searches. At the top of the list was the Cook County Sheriff’s Office, which recently agreed to disable one of its own gang databases.

More than 32,000 queries came from federal immigration authorities, according to the report.

The report recommended a number of ways to address problems with the gang database system. In addition to creating stronger standards to improve accuracy, the Police Department should engage with the public about its collection of gang data and allow people listed to appeal the information. The inspector general’s report also advised the Police Department to evaluate whether the database is actually useful and “serves violence reduction efforts in the city.”

“CPD does not concur that a public evaluation is necessary,” Johnson responded in his letter. Johnson went on to promise that the data will be cleaned up and verified, and that the department will conduct audits of data-sharing agreements with external agencies. He also pledged to create an appeal process, though it would require going to police headquarters to fill out paperwork.

Mayor-elect Lori Lightfoot has said she’ll push to dismantle or retool the system.

“I’m going to get rid of it as soon as is practical,” she said in an interview last week with the Chicago Sun-Times. “And we’re not going to set up an alternative until we have a real process for transparency that the public can see. And it has to have a bona fide law enforcement purpose, and not just throwing names into a database without any real policy and practical regulation on who gets in and who stays.”

At a press conference to announce the release of the report Thursday morning, Ferguson said it’s now up to city elected officials to hold “robust” discussions with the public about the future of the database.

“It’s critically important that the City Council hold hearings on this,” he said.

Read the Chicago Inspector General’s Report

View on DocumentCloud.

Office of Inspector General, City of Chicago

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