Informants in China’s drug investigations: operational logic, practical challenges, and system reform

In the shadowy world of drug trafficking, where transactions happen in secret and no one is hurt in the moment to call for help, police face a unique challenge. Unlike a robbery where a victim can describe the thief, or a burglary where broken glass serves as evidence, drug deals are consensual acts between two willing participants who actively hide their tracks. To catch these criminals, law enforcement agencies around the world often turn to a specific tool: the informant. An informant is a person recruited by the police to gather intelligence, penetrate criminal networks, or even buy drugs on behalf of the authorities to catch a seller. This method is a necessary compromise; it allows police to see into a hidden world, but it requires bending ethical rules, such as tolerating small crimes to catch big ones or deceiving suspects to build trust. The balance between catching criminals and treating them fairly is the central tension of this field. When the rules for using these helpers are unclear, the system risks becoming a tool for abuse rather than justice.

A recent study by Tianmin Wang of Xiamen University takes a deep, data-driven look at how this system works in China, a country with one of the world's strictest anti-drug policies. The researcher analyzed thousands of court records to understand the reality behind the headlines. They examined 8,592 court judgments from 2017 to 2023, covering drug cases from every corner of the country, and supplemented this with detailed reviews of 15 specific cases. Their goal was to move beyond theory and see exactly how informants are used, what problems arise, and whether the current system protects the rights of the accused. The findings reveal a system that is highly effective at catching criminals but is currently operating with significant gaps in oversight, leading to practices that can undermine the fairness of the legal process.

The study identifies three main ways the Chinese system uses informants, driven by a need for efficiency and results. First, there is a "moral compromise." Because drug crimes are so secretive, police cannot rely on standard methods like searching a house or interviewing a victim. Instead, they recruit people who are already involved in the drug trade to act as eyes and ears. This requires accepting that these helpers might continue to commit small crimes or that police might have to lie to suspects to gain their trust. Second, the system uses "covert means" to bypass strict legal limits. In China, police usually need a judge's permission to search a home or wiretap a phone. However, by using an informant to walk into a suspect's house or talk to them, police can gather evidence without needing that official permission, effectively sidestepping the legal hurdles that would otherwise stop them. Third, the system employs "procedural deterrence." Because it can take a long time to process complex drug cases, the police sometimes use informants to increase the severity of the charges immediately. For example, an informant might encourage a suspect to buy a larger amount of drugs than they originally intended, just to push the sentence into a higher, more severe category. This creates a sense of immediate, harsh punishment to deter others, even if the investigation itself is delayed.

While these methods help police solve cases, the data shows they come with serious costs. The researcher found that in 34% of the cases they studied, the purpose of using an informant had drifted away from catching real criminals. Instead, police sometimes used informants to generate arrests just to meet performance goals, a practice known as "merit-buying." In these instances, an informant might pressure a person with no prior criminal record to buy a small amount of drugs just so the police could make an arrest. In another 13% of cases, the amount of drugs involved was manipulated to ensure a harsher sentence. The study also uncovered that 32% of cases involved arbitrary recruitment, where police coerced vulnerable people into becoming informants. These individuals were often facing financial trouble, family crises, or addiction, and were threatened with arrest or detention if they did not cooperate. In many of these situations, the "voluntary" agreement was signed under duress, with the person having little choice but to comply.

Perhaps the most alarming finding concerns the lack of supervision. The study revealed that in 62% of the cases, there was no written record of how the informant was recruited or what they were authorized to do. In 78% of the cases, there was no real-time monitoring of the informant's activities. This means that once an informant is on the street, there is often no one watching to ensure they do not break the law, lie to the police, or coerce a suspect. Unlike systems in countries like the United States or Canada, where there are strict rules, background checks, and independent oversight, China's system relies heavily on internal police discretion. The study notes that in the US and Canada, defendants have a much stronger right to know who the informant is and to challenge their actions in court. In China, this information is often kept secret, making it nearly impossible for a defendant to prove they were unfairly targeted or entrapped.

The researcher argues that these problems are not just minor glitches but structural issues that threaten the legitimacy of the entire anti-drug effort. When the system prioritizes results over fairness, it risks punishing innocent people or punishing people for crimes they were tricked into committing. The study suggests that the current approach, while effective at reducing drug numbers in the short term, creates a "legitimacy gap" where the public may lose faith in the justice system. The author proposes a set of reforms that would bring more order to the chaos without sacrificing the ability to fight drugs. They recommend creating standardized rules for recruiting informants, including mandatory background checks and written consent forms that clearly explain the risks. They also call for a multi-level supervision system where prosecutors, not just police officers, review the use of informants to ensure they are not abusing their power. Finally, they suggest giving defendants better access to information so they can challenge unfair evidence in court.

The path forward, according to the study, is not to copy Western systems exactly but to adapt proven principles to fit China's unique legal and cultural context. The researcher suggests a "regulated flexibility" approach, where strict rules are applied to high-risk situations, like long-term infiltration, while simpler rules can be used for low-risk information gathering. This would allow the system to remain agile while ensuring that the most dangerous practices are kept in check. By implementing these changes, China could maintain its strong stance against drug trafficking while ensuring that the methods used to fight it remain fair and just. The study concludes that a system built on transparency and accountability is not only more ethical but also more sustainable in the long run, as it reduces the risk of wrongful convictions and strengthens the public's trust in the rule of law.