Evaluation of canines for accelerant detection at fire scenes

Area of Science:

• Forensic Science
• Animal Behavior

Background:

• Canines are increasingly utilized in forensic science for accelerant detection in fire investigations.
• Establishing the sensitivity limits of canine accelerant detection is crucial for reliable evidence gathering.

Purpose of the Study:

• To determine the minimum detectable quantities of common accelerants by trained canines.
• To assess canine reliability in detecting accelerants under controlled and simulated real-world fire conditions.

Main Methods:

• Controlled application of varying micro-liter amounts (0.01 to 10 microL) of gasoline, kerosene, and isopars to sample paths.
• Two canines were trained and tested on sample paths containing accelerants and control materials.
• Recording canine alerts and non-alerts across different accelerant concentrations and sample types (wood, carpet).

Main Results:

• Canines reliably detected 0.01 microL of gasoline, kerosene, and isopars, meeting or exceeding standard laboratory detection methods.
• Occasional false alerts were observed on background materials, particularly styrene residues from pyrolysis or intentional application.
• Detection success decreased with smaller accelerant amounts (0.1 to 1.0 microL) at actual fire scenes compared to controlled settings.

Conclusions:

• Trained canines demonstrate high sensitivity for detecting low concentrations of common accelerants.
• Canine performance can be affected by background odors and the complexity of real fire scene samples.
• Further research may refine canine training to improve specificity and reduce false alerts in diverse fire investigation scenarios.