Clear Scientific, a wholly-owned subsidiary of Nano Terra, proposes to develop a low-cost and wearable detector badge that quickly alerts the user in real time to the presence of solid or aerosolized fentanils with an audible and visual alert. Current commercial opioid detectors are bulky, costly, and cannot be used passively in real time. Clear Scientific will leverage their expertise in ultra-sensitive dosimetric detection of threat agents to advance their highly-sensitive opioid sensor for use in a compact wearable badge. The proposed system will be unobtrusive and inexpensive, while offering the necessary high sensitivity, high selectivity (distinguishes amongst fentanyl analogs and cutting agents), and rapid response time needed for the requirements of law enforcement and first responders. The system will provide a real-time response based on the effective human toxicity of operational environments containing multiple opioid species whose concentration or identity may not be known.