Enhancing Drug Checking with Human-Centered Design Innovations Optimizing Drug Checking Tools through HFE

Accurate, user-friendly drug checking tools are critical in reducing overdose risks, especially in settings where people test substances without professional guidance. This study examined whether a small design change—a 10mg micro scoop—could improve how users interact with fentanyl test kits. During a multi-day music festival, 50 participants were randomly assigned to use one of two test kits: one with the scoop (Version A) and one without it (Version B). Each person used written instructions only and completed a survey afterward. Participants using the scoop-equipped kit achieved 100% accuracy when interpreting results, compared to 84% accuracy in the group without the scoop. They also rated the instructions as clearer—91% versus 73%—and reported feeling more confident and less confused during testing. Many described the scoop as helpful in measuring and mixing the sample. These findings show that even simple, user-centered design improvements can make drug checking more effective and accessible in real-world environments. Improving ease of use may increase the reliability and impact of harm reduction tools in preventing overdose. Subject Classification Codes: Health and Safety (e.g., 62P10, 62M30); Public Health (e.g., 91C44); Addiction and Substance Use (e.g., 92E70); Human Factors and Ergonomics (e.g., 94C37).