TCFP Fire Investigator Practice Exam

The most desirable collection areas for liquid accelerants in a fire investigation are typically found in the lowest areas, particularly at the edges of burn patterns. This is because liquid accelerants tend to flow downwards due to gravity and can pool in these areas, making them prime spots for detecting residues. When a fire occurs, accelerants may saturate the floor or accumulate in low-lying regions, thus providing essential evidence for determining the origin and cause of the fire.

In addition, the edges of burn patterns are crucial for investigators. These areas often show a clearer distinction between burned and unburned material, which can help in understanding how the fire spread and whether accelerants were used. This methodology is critical in ensuring that investigators collect samples that give the best chance of revealing the presence of any flammable liquids that may have been used to aid the fire’s ignition and spread.

This contrasts with collection areas like high spots in the structure or open areas without obstacles, where the likelihood of encountering pooled accelerants is significantly reduced. Similarly, while near windows and doors can be important for potential access points, they are not the optimal areas for collecting liquid accelerants, which are more likely to be found at lower elevations.