I didn't make this up, read it on a news release, assume it is true.
At Boston Logan airport a passenger took a suitcase through TSA that had a strange smell. Turns out to be a kind of natural rat poison the passenger was taking to Bejing, and it was made of camphor.
NO PASSENGERS WERE AFFECTED, BUT 15 TSA EMPLOYEES WERE EVACUATED AND 4 SENT TO HOSPITAL.
Who knew camphor was both potent and discriminating?