Nearly four years after its creation, South Korea’s Corruption Investigation Office for High-ranking Officials -- a flagship reform of the liberal Moon Jae-in administration -- is again under fire.
Established in late January 2021 to combat corruption among senior officials and operate independently of the prosecution, the agency was initially hailed as a groundbreaking solution to systemic abuses of power.
But its track record has fallen far short of expectations, marred by few achievements, repeated investigative failures and an inability to hold high-profile figures accountable.
Now, with mounting criticism over its handling of President Yoon Suk Yeol’s alleged insurrection, the CIO faces renewed scrutiny over whether it can fulfill its ambitious mandate -- or if its very purpose needs reevaluation.
One of the criticisms lies in its repeated failures to secure arrest warrants, having seen five consecutive rejections by the courts.
The most recent rejection occurred in December 2023, when the court dismissed the CIO’s arrest warrant request for a senior police officer accused of bribery. This followed an earlier failure in August of the same year, despite the CIO reinforcing its case. The court ruled that the bribery allegations remained insufficiently substantiated.
Similarly, in November 2023, the CIO sought an arrest warrant for a senior Audit and Inspection Board official over allegations of misconduct but was unsuccessful. In 2021, it made two attempts to secure an arrest warrant for a chief prosecutor suspected of involvement in bribery, but both attempts failed.
The CIO’s challenges go beyond failed warrants. In some cases, the institution even faced refusal from suspects summoned to attend questioning.
Yoo Byung-ho, the former secretary-general of the Board of Audit and Inspection, ignored five summonses between October and November 2023 before finally appearing for questioning on the sixth attempt in December of that year.
Similarly, in December 2023, two prosecutors under investigation for negligence in a sexual bribery case involving a former vice justice minister refused to attend hearings or respond to written inquiries, leaving those cases unresolved.
The CIO has directly prosecuted three cases, two of which resulted in acquittals during the first trials in 2022 and 2023.
While the CIO considered appealing these rulings, it ultimately abandoned further legal proceedings in December 2024. The third case, involving bribery allegations against a senior prosecutor, ended in acquittal during the second trial in December 2024.
The CIO also remained largely inactive throughout 2024, with no significant investigative milestones before it launched an investigation into Yoon's Dec. 3 martial law declaration and related insurrection and power abuse allegations.
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