1. “distinct region of injury or cluster of fire results” – the realm of harm need to be Plainly distinguishable from other locations of harm from the identification of line(s) of demarcation. Resultant floor burn sample from carpet pad seam with out use of ignitable liquids (Wooden et al. 2012) https://fireinvestigation23444.full-design.com/getting-my-fire-investigation-to-work-69645478