Smoke detectors for the home contain a minute particle of radioactive material.
Every once in a while, the local “Trash-to-Steam” plant (think incinerator heating water) has an alert. One of their radioactive material scanners will find a smoke detector in an incoming trash truck and sound the alarm.
This buoys my hopes that the proper authorities have the same or even better detectors to find any radioactive material big enough to hurt anyone.
Of course Homeland Security would handle that information expediently and in the proper manner to thwart any evil intent.
