Legal InsightsCriminal Cases in Korea

A First Drug Offence in Korea: Detention, Disposition and Treatment

November 8, 2026

In Korea a drug case usually begins with someone else's arrest, and by the time you are contacted the file already contains your messages, your transfers and possibly your test results. Understanding the order in which the case develops, and where the outcome is actually decided, changes what can be done about it.

This guide follows a first offence from the first contact with the investigation through to the orders that attach after conviction. It is not a prediction of any outcome; the substance, the number of occasions, whether supply was involved and the test results all move the case.

The sequence a first case follows

Stage	What happens
1. A related person is arrested	A dealer or another user is arrested first. Message records and bank transfers are reviewed, and people named in them receive an attendance request
2. Testing	A preliminary reagent test at the investigation stage, followed where necessary by laboratory analysis of urine and hair
3. Detention decision	Whether a detention warrant is sought, decided against the statutory grounds and then reviewed by a judge at a warrant hearing
4. Disposition	Suspension of indictment, summary indictment, formal indictment, or a finding of no suspicion
5. Orders after conviction	Attendance or rehabilitation orders, treatment protection, and confiscation or collection of the proceeds

Why the case may already be built

Most use cases do not start with a raid on the user. They start with the seller or another user. Once messages and transfers are in the file, a person named in them is already a suspect before anyone calls, which is why "nobody has contacted me" is not the same as "there is no case".

Hair analysis can detect use going back months. That has two consequences: an account that understates the number of occasions can be contradicted by the laboratory result, and an account that concedes occasions the laboratory cannot confirm gives away more than the evidence requires.

The statutory penalty depends on the substance

Conduct	Provision	Penalty
Smoking, ingesting, possessing, receiving, carrying, keeping or using cannabis	Narcotics Control Act art. 61(1)	Up to 5 years, or a fine up to 50 million won
Using, possessing, buying or receiving a psychotropic substance such as methamphetamine	art. 60(1)	Up to 10 years, or a fine up to 100 million won
Importing, exporting, manufacturing, selling or brokering	art. 58	Life imprisonment, or 5 years or more. Where for profit or habitual: death, life, or 10 years or more
Supplying narcotics to a minor, or selling or providing a psychotropic substance to a minor	art. 58(1)7	Aggravated under the same provision

The largest single difference in these cases is whether the conduct is characterised as personal use or as supply. Passing drugs to a friend can be assessed as delivery or sale, and that changes the applicable provision rather than merely the sentence.

Detention is the first turning point

Criminal Procedure Act art. 198(1) states that investigation of a suspect is in principle conducted without detention. Detention requires one of the grounds in art. 70(1): no fixed place of residence, a risk of destroying evidence, or flight or a risk of flight. Article 70(2) requires the court to consider the seriousness of the offence, the risk of reoffending, and the risk of harm to victims and witnesses.

In practice the weight falls on whether the person was involved in supply, whether use was repeated, and how many people are connected to the file. These are the questions that decide whether a first offender spends the investigation in custody.

The four possible dispositions

When the investigation closes, the case ends in one of four ways: suspension of indictment, summary indictment (a fine), formal indictment (a trial), or a finding of no suspicion.

In first-time personal-use cases, suspension of indictment on conditions directed at treatment and rehabilitation is one route, and a suspended sentence is possible where the case goes to trial. None of this can be promised in advance. The substance, the number of occasions, any involvement in supply, the test results and demonstrated willingness to engage with treatment all change the analysis.

What follows a conviction

Attendance and rehabilitation orders. Where a person is convicted, or a summary order is issued, for using, smoking or ingesting a narcotic, the court imposes an attendance order or a rehabilitation education order of up to 200 hours (art. 40-2(2)).
Treatment protection. The Act provides for treatment protection institutions, to determine whether a person is addicted and to provide treatment for addicts (art. 40).
Confiscation and collection. Narcotics provided for the offence, and the proceeds derived from it, are confiscated; where confiscation is not possible, the equivalent value is collected (art. 67). Where there were sales, the collected amount is calculated separately and can be substantial.

Where statements go wrong

Drug cases often rest heavily on the statements of co-suspects. Two errors recur. Accepting occasions that cannot be confirmed hands the prosecution a case it did not have. Denying what the laboratory result independently establishes damages the credibility of everything else said in the interview.

The working rule is to separate what is confirmed by evidence from what is genuinely uncertain, and to state each accordingly. That is a decision to take with counsel before the interview, not during it.

If a family member has already been arrested

Three things need to be established first: which agency is conducting the investigation, when the warrant hearing is scheduled, and whether a meeting is possible. Once a warrant hearing date is fixed, preparation time is very short.

For foreign nationals there is a further layer, because a drug record is reviewed separately in visa and residence decisions and that review can begin before the criminal case ends. See our guides on drug charges for foreigners and visa consequences of criminal charges.

Contact Taeshin Law Firm for a confidential consultation in English. If a warrant hearing has been scheduled, contact us before that date.

Frequently Asked Questions

Will a first drug offence in Korea mean detention?

Not automatically. Investigation is in principle conducted without detention. Detention requires a statutory ground such as no fixed residence, risk of evidence destruction or flight, and courts also weigh the seriousness of the offence and the risk of reoffending.

Can a first offence be resolved without a trial?

It can. Suspension of indictment, sometimes on conditions directed at treatment, is one possible disposition, and a summary order is another. The outcome depends on the substance, the number of occasions, whether supply was involved and the test results.

How far back can drug use be detected?

Hair analysis can detect use from several months earlier, which is far longer than a urine test. This is why an account of the number of occasions must be checked against the laboratory result.

What else is imposed besides the sentence?

An attendance or rehabilitation order of up to 200 hours, possible treatment protection where addiction is found, and confiscation of the drugs and proceeds, with collection of the equivalent value where confiscation is not possible.