July 2004 – Volume 6 – Number 3
Research and Technology
Specialized Use of Human Scent in Criminal Investigations
Blended Odors
A scent item with multiple human odors is a contaminated-scent article. The term contaminated-scent article, however, is a misleading description. Due to the resiliency of human scent, there are few evidence items that carry only one human scent. The items used for scent articles are manufactured, transported, stocked, and sold by people who, by touching them, contribute additional scents. Scent canines have the ability to work accurately with an article containing blended human odors.
European studies have demonstrated the ability of properly trained scent-discrimination dogs to accurately match a target's scent to a contaminated-scent article. These studies established the basis for use of scent identification lineups as reliable evidence in criminal proceedings. In one study using scent-identification lineup dogs, it was determined that dogs, "like other animals, are capable of discerning the odor of different individuals on an object, and can use these odors in scent identification lineups" (Kalmus 1955; Schoon and Haak 2002B)...
Dogs can identify a person's odor that is blended with other human odors. Using a variation of tracking known as trailing, bloodhound handlers use dogs to differentiate a trail of specific human odor from all other odor trails in a search area. The trailing dog is trained to identify and follow the human scent presented to it by the handler. This scent is presented as a scent article containing the unique scent of a suspect or missing person. If a trail of scent matching the scent on the scent article is at that start location, the dog commences to trail and follows that trail to the exclusion of all others. If there is no matching scent trail at the start location, the dog refuses to trail.
http://www.fbi.gov/hq/lab/fsc/backissu/july2004/research/2004_03_research03.htm
MeBO Research
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