A device receives, at a first time, first sensor data from a sensor associated with a vehicle, wherein a passenger and an item are located within the vehicle after the first time, and determines a first weight based on the first sensor data. The device receives, at a second time, second sensor data from the sensor, wherein the passenger is not located within the vehicle at the second time, and determines a second weight based on the second sensor data. The determines whether the item is located in the vehicle at the second time based on the first weight and the second weight, and selectively performs actions based on determining whether the item is located in the vehicle. The actions are performed after the item is determined to be located in the vehicle, and are not performed after the item is not determined to be located in the vehicle.