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Debate Intensifies Over Bill to Abolish Prosecutors' Supplementary Investigation Powers

모민철모민철 기자· 6/27/2026, 12:26:51 PM· Updated 6/27/2026, 12:26:51 PM

Bill to Abolish Prosecutors' Supplementary Investigation Powers Sparks Heated Debate

Political and legal circles are abuzz as some lawmakers from the ruling bloc, including the Democratic Party of Korea and the Rebuilding Korea Party, recently co-sponsored an amendment to the Criminal Procedure Act that would completely abolish the prosecution's supplementary investigation powers. This bill, coinciding with adjustments to the investigative functions of the upcoming Prosecutor's Office slated to launch in October, has emerged as a key issue in prosecutorial reform, drawing significant attention to its future legislative process and potential ramifications.

The core of this bill is to eliminate the "supplementary investigation rights" that currently allow prosecutors, under the Criminal Procedure Act, to request further investigation or conduct their own investigations when police findings in cases they have indicted are deemed insufficient. This move is interpreted as an effort to legally limit the prosecution's investigative scope, following the readjustment of investigative powers between prosecutors and police implemented in September 2022. Proponents argue that such measures are necessary to decentralize prosecutorial charging powers and reduce the potential for human rights violations during investigations. Particularly, with discussions underway to significantly curtail the prosecution's direct investigative functions for the Prosecutor's Office launching in October, abolishing supplementary investigation powers is seen by some as part of a larger strategy to dismantle the prosecution's entrenched investigative privileges.

Key sponsors of the bill include former Democratic Party leader Chung Jin-suk and lawmaker Kim Yong-min, Rebuilding Korea Party lawmaker Park Eun-jung, and independent lawmaker Choi Hyuk-jin. Chung Jin-suk has emphasized a "speedy process," urging ruling bloc parties to quickly adopt the bill as a joint party platform. This highlights a strong will to pass the legislation. Such moves clearly signal the ruling bloc's intent to complete prosecutorial reform and foreshadow fierce legislative battles with the opposition parties. The abolition of supplementary investigation powers, initially discussed as a core issue for the August 17 party convention, has now entered the concrete legislative push stage through the actual bill sponsorship.

Key Contents and Expected Repercussions

The essence of the proposed amendment to the Criminal Procedure Act is the deletion of provisions that allow prosecutors to order supplementary investigations or conduct them directly after the police have completed their initial probe, even in cases the prosecution has indicted. Under current law, prosecutors can request supplementary investigations from the police if they find the police's findings in an indicted case to be insufficient. Additionally, prosecutors retain some authority to directly investigate specific crimes such as corruption and economic offenses.

If this bill passes, the prosecution's investigative functions are expected to be significantly curtailed. Prosecutors are likely to focus more on filing and maintaining indictments rather than serving as investigative bodies. This aligns with the broader trend of prosecutorial reform aiming to separate investigative and prosecutorial powers. The legal community is offering varied analyses on the potential impact on the entire judicial system. Positive aspects highlighted include strengthening police investigative capabilities and enhancing investigative independence by preventing arbitrary prosecutorial intervention. It is also argued that this could help curb excessive abuse of prosecutorial power and protect citizens' fundamental rights.

Conversely, negative forecasts are also prevalent. Concerns are being raised that abolishing supplementary investigation powers could lead to investigative vacuums, particularly concerning corruption and serious crimes. Specifically, the argument is made that if the prosecution's expert guidance or intervention disappears in complex and specialized areas like economic crimes, financial crimes, and organized crime, it could become difficult to effectively prosecute offenders. This, in turn, could lead to decreased investigative efficiency and pose a threat to public safety. Furthermore, it is pointed out that the accumulation of investigative information and know-how within the prosecution would become difficult, potentially leading to a regression in investigative techniques in the long term. These differing perspectives foreshadow sharp confrontations during the bill's review process.

Arguments For and Against, and Societal Discussion

Those advocating for the abolition of supplementary investigation powers primarily cite inefficiencies and the potential for human rights violations stemming from the prosecution's monopoly on investigative authority. They criticize the prosecution for wielding extensive investigative power before indictment to pressure defendants and for abusing its political and social influence over investigation outcomes. The amendment bill co-sponsored by ruling bloc lawmakers can be seen as an attempt to decentralize prosecutorial power and rebalance the judicial system by strengthening the police's role during the investigative phase. Moreover, as the Prosecutor's Office, set to launch in October, is planned to minimize the prosecution's direct investigative functions, abolishing supplementary investigation powers could accelerate this reform trend.

In response, prosecutors, conservative legal circles, and some opposition parties are raising concerns. They argue that abolishing supplementary investigation powers could hinder investigative expertise and speed. Specifically, they contend that it would be difficult to effectively prosecute crimes if the prosecution's expert investigative guidance or intervention is removed in complex and specialized areas like economic crimes, financial crimes, and organized crime. Prime Minister Han Duck-soo has also indirectly indicated his stance that weakening investigative capabilities under the guise of "prosecutorial reform" is not desirable. They emphasize that the prosecution's supplementary investigation powers must be maintained to minimize investigative gaps and protect citizens' legal interests. Opinions are divided among civic groups as well, with calls for in-depth discussions on the practical effects and side effects of the investigative power adjustments.

The debate surrounding the abolition of supplementary investigation powers thus goes beyond a mere amendment of legal provisions, posing fundamental questions about how to design the foundation of South Korea's criminal justice system. The sharp differences in positions among various sectors are expected to intensify further during the National Assembly's review process.

Future Prospects and Legislative Tasks

Although former lawmaker Chung Jin-suk is emphasizing a "speedy process" to expedite the bill's passage, the legislative path for the supplementary investigation powers abolition bill is expected to be challenging. Given the current political landscape in the National Assembly, it could take considerable time for the bill to pass committee reviews and be brought to a floor vote. Particularly, as the bill's core content directly concerns the prosecution's investigative authority, discussions in the Legislation and Judiciary Committee are deemed crucial. Fierce confrontation and negotiation between the ruling and opposition parties are inevitable during this process, and it is widely believed that passing the bill will be difficult without opposition cooperation.

The ruling bloc is likely to strongly push for the bill's passage, using the launch of the Prosecutor's Office as a justification. To this end, they are expected to maintain dialogue channels with the opposition while attempting to secure the bill's legitimacy through public opinion campaigns. The opposition, on the other hand, will likely try to block the bill's passage by focusing on its potential side effects and the risk of investigative gaps. Given the parliamentary seat distribution, the possibility of the bill failing cannot be ruled out if the opposition votes against it. Therefore, the success of this bill is expected to be heavily influenced by the future power structure within the National Assembly and the political dynamics between the ruling and opposition parties.

If the bill passes, significant changes are anticipated in two aspects: redefining the role of the prosecution and strengthening police investigative capabilities. This is also linked to the functions of the Prosecutor's Office scheduled to launch in October, potentially marking a crucial turning point for reforms across the entire South Korean judicial system. However, if side effects such as investigative gaps or inefficiencies arise, accountability issues and discussions for further institutional improvements could follow. While the outcome of the supplementary investigation powers abolition bill remains to be seen, the process itself is expected to leave a significant mark on discussions for judicial reform in Korean society.

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