Back in '02, on my way back from Germany, they were walking around with one of these dogs. He identified my backpack and I started freaking out... I thought it was some kind of drug dog or something and I was trying to think of why he might be sniffing my bag . The handler told me that they sniff for agricultural stuff and asked if I had anything. I told him I did not, forgetting the pressed edelweiss I had. Pretty incredible that they can identify the smell of 1 small flower.