Ability of dogs to discriminate human odor exposed to chemical detergent

In the recherche part of our thesis we familiarize ourselves with the human odor, theories of its origin, definition, anatomy of human skin and odors, composition of individual human odors and with odor secretion. We also look closer on the topics of odor absorbent and its use in the world, the transmission of odors to odor sensors and securing of scents. This section of our thesis discusses the resistance and survival abilities of odor, scent identification method and its history, organic acids, and defines the application of laundry detergents and ultrasonic washers. Aim of our thesis was to verify the relevance of the use of chemical detergents in the purification process when working with scents. We tried to verify the ability of detergents to degrade the human scent on odor absorbents to such an extent, that specially trained dogs would not be able to identify it. Our experiment was following a precise determination methodology. In the first phase samples were collected from the hands of targeted persons to a scent carrier - a metal cylinder (extirpate odour), by one researcher. In the second phase samples were collected from the body to a textile carrier, by another researcher. The metal scent carriers were processed. Some of them were left as they were (control sample) and some were exposed to chemical detergents with and without usage of an ultrasonic washer. In the experiment where we tried to identify the odour samples, six bitches of German shepherd were used. They were specially trained for odour identification. Each dog was let three times to identify the target scent exposed to a detergent and three times to identify the target scent not exposed to a detergent. Target smell was randomly deposited between other samples and its position was changed, so that the handler did not know its position and thus was unable to affect the work of his dog. The indicator of positive identification was a sign the dogs were taught - to sit or lay in front of a sample. Any dog was unable to identify the scent which was exposed to chemical detergent and all dogs identify the scent unexposed to a chemical detergent. Our experiment has shown that the use of chemical detergents in the purification process when working with scents is relevant to the degradation of individual human scent