smart dog This is a pretty amazing use of a dog's sense of smell!!!!! And on edit - I found out it's fake. KLM doesn't really do this, which begs the question "why not?"
Finding the person, by matching the scent on the item found, is very easy for a well trained scent detection dog.
You can train a dog to find and react to any scent, even cancer inside the human body. Some of these dogs are finding cancer that does not even show on the latest and best imaging technology available.
The big question is: Is it economically feasible? In most cases, the answer is no.