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Effect of background interference on accelerant detection by canines
M E Kurz1, S Schultz, J Griffith
1Department of Chemistry, Illinois State University, Normal 61790, USA.
Journal of Forensic Sciences
|September 1, 1996
Summary
Canine accelerant detection dogs show high success with gasoline but struggle with lower concentrations and other accelerants. Laboratory confirmation and accurate training records are crucial for reliable canine alerts.
Area of Science:
- Forensic Science
- Animal Behavior
Background:
- Canine accelerant detection dogs are vital in arson investigations.
- Understanding detection limits and potential interferences is critical for accuracy.
Purpose of the Study:
- To evaluate the detection limits of canines for common accelerants.
- To assess canine ability to differentiate accelerants from pyrolysis products.
Main Methods:
- 34 canines participated in tests assessing detection of gasoline and other petroleum products at various concentrations.
- Tests included various matrices like burnt carpet and plain carpeting.
Main Results:
- Dogs were highly successful detecting 5 microL of gasoline on burnt carpet.
- Detection success decreased significantly with lower gasoline concentrations (0.05-0.2 microL).
- Canines showed lower success rates with other petroleum products and frequently alerted on samples without accelerants.
Conclusions:
- Canine detection of accelerants is concentration-dependent and can be affected by pyrolysis products.
- Laboratory confirmation of canine alerts is essential.
- Accurate field and training records are necessary to establish canine credibility.