No. The handkerchief as well is part of history. After the Nazis began to use police dogs to sniff out hidden passengers on the fishing boats, Swedish scientists worked swiftly to prevent such detection. They created a powerful powder composed of dried rabbit’s blood and cocaine; the blood attracted the dogs, and when they sniffed at it, the cocaine numbed their noses and destroyed, temporarily, their sense of smell. Almost every boat captain used such a permeated handkerchief, and many lives were saved by the device.
