Abstract: Methods and systems for detecting gunpowder are provided. The method includes collecting sensor data from a plurality of vehicles each comprising one or more gunpowder sensors, detecting presence of gunpowder based on the sensor data of the gunpowder sensors, determining a detection location where the presence of gunpowder is detected based on vehicle location data from the vehicles, determining whether the detection of the presence of gunpowder is false positive based on the detection location and map data from a crowdsourced map, and communicating the detection of the presence of gunpowder in response to determining that the detection of the presence of gunpowder is not false positive.