When every second matters: In the heart of a large city, a police officer patrols a bustling transit stop equipped with a CBRN sensor synced to his smartphone. Suddenly, an alert blares through their device as a young man approaches, donning a suspicious backpack. The officer glimpses the sensor readings — two radiological isotopes. While one is innocuous, the other signals a potential dirty bomb. With time ticking away, the officer urgently calls for backup, knowing countless lives hang in the balance.