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Drug Club Investigation Gone Too Far: Supreme Court Confirms Charges Thrown Out for Unlawful Prosecutorial Investigation

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Two members of a Seoul university drug ring — including a licensed physician — have had their narcotics convictions permanently overturned because the prosecutor who charged them had no legal authority to investigate them in the first place. Here are the key points.

Issue

Where police refer a narcotics case to prosecutors involving specific named suspects, can the assigned prosecutor use information obtained during that investigation to independently open a new investigation into different suspects — and bring charges based on that self-initiated investigation?

Background: The Restriction on Prosecutorial Investigations

  • Following major reforms to prosecutorial powers in Korea, the Prosecutors’ Office Act now restricts prosecutors’ ability to initiate their own investigations. Under Article 4(1)(1), prosecutors may directly investigate only certain serious categories of crime. For other crimes, prosecutors generally receive cases from police and may supplement the investigation — but may not independently initiate investigations into new suspects beyond the scope of what was referred.
  • Article 4(2) separately prohibits the same prosecutor who conducted an investigation from also bringing the indictment.

Facts

  • Police investigated and referred to prosecutors two narcotics cases involving the leadership of a university social club called “Gganbu,” which operated as a drug-use circle among students from elite universities in the Seoul metropolitan area.
  • The police referral documents contained no mention of Bae or Lee — the two defendants in this case — and made no reference to their alleged conduct or any connection to them.
  • During his investigation of the referred cases, the assigned prosecutor at Seoul Southern District Prosecutors’ Office received voluntary surrender statements from other club members, who stated they had used drugs together with Bae and Lee.
  • The prosecutor used these statements as a basis to independently open a new investigation into Bae and Lee, gather evidence, and bring charges — entirely outside the scope of the original police referral.
  • Bae, a student in his twenties, was charged with purchasing and using methamphetamine from the club president and others, receiving and using LSD and MDMA, and smoking liquid cannabis through an electronic cigarette device — conduct spanning February to December 2023.
  • Lee, a physician in his thirties, was charged with purchasing, using, and possessing MDMA and smoking liquid cannabis between October and November 2023.

Lower Court Decisions

  • The trial court convicted both defendants. Bae received two years and six months in prison, suspended for three years; Lee received one year, suspended for two years.
  • The appellate court reversed both convictions and dismissed the charges, finding the prosecution itself was void. The appellate court held that Bae and Lee’s offenses had no specific individual connection to the cases police had referred — they were separate people, committing separate acts, discovered through a separate investigative trigger. Expanding the investigation to new suspects on the basis of self-obtained information constitutes initiating a new investigation outside the permitted scope, not supplementing a referred case. Both the initiation of the investigation and the resulting indictment violated the Prosecutors’ Office Act.

Supreme Court Decision

  • The Supreme Court (Criminal Division 1, presiding Justice Cheon Dae-yeop) dismissed the prosecution’s appeal on August 13, 2026, confirming the charges dismissed.
  • The court found no error in the appellate court’s interpretation of the permitted scope of prosecutorial investigations under the Prosecutors’ Office Act, and upheld the dismissal in full.

Key Takeaways

  • A voluntary surrender statement obtained from a third party during the investigation of a referred case does not authorize a prosecutor to expand the investigation to entirely new suspects who had no specific, individual connection to the referred case.
  • The test for whether a prosecutor’s investigation of additional suspects falls within the permitted scope is whether there is a direct and specific connection between those suspects and the case that was originally referred — not merely a general factual or contextual relationship.
  • Where a prosecutor initiates an investigation outside the permitted scope, any subsequent indictment is procedurally void regardless of the strength of the underlying evidence against the defendant.
  • This ruling applies the same framework established in earlier decisions on prosecutorial overreach — the chain of unlawful initiation, unlawful investigation, and unlawful indictment produces a mandatory dismissal of charges.
  • The case has no bearing on the underlying drug use, which may still be prosecutable through a lawful investigation properly initiated by police.

Why This Matters

This is a significant application of Korea’s post-reform prosecutorial restriction framework to a high-profile drug case, and it confirms that courts will enforce the boundaries of prosecutorial investigative authority even where the underlying conduct is clearly criminal and the evidence strong. For prosecutors, the ruling reinforces that using information obtained during a referred investigation to open new lines of inquiry into unrelated suspects requires a fresh, lawfully initiated process — not an internal extension of the existing case file. For defense practitioners, it establishes that the threshold question in any prosecution arising from an expanded investigation is whether the original referral created a genuine direct connection to the new suspects — and that absence of such a connection is fatal to the entire prosecution.

Article: https://www.lawtimes.co.kr/news/articleView.html?idxno=224797

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