NCJ Number
81004
Journal
Fire and Arson Investigator Volume: 32 Issue: 2 Dated: (October-December 1981) Pages: 9-12
Date Published
1981
Length
4 pages
Annotation
The use of a grid diagram to aid in investigations of fire scenes is described by a retired police officer who has been active in fire investigations for the past 8 years as a private consultant.
Abstract
To prove the fire cause, the search of the fire scene must be thorough, complete, and competently performed. Investigators often act from habit rather than using a system. By drawing a grid diagram of the fire scene, the investigator can note the exact location of evidence. A grid approach can also promote a detailed and thoroughly documented examination of the entire fire scene, including a comprehensive inspection of all outside grounds. The coded grid diagram also simplifies the identification of photographs taken at the scene and provides reference points from which to take measurements. The grid can also be used during the removal of debris, especially if the removal is performed by hand. The grid approach helps prevent the destruction of evidence by the members of the search team, improves courtroom testimony, and demonstrates to the court that the investigator is a thorough and competent professional. Actual structural features or imaginary reference points may be used in constructing the grid diagram on graph paper. Several sheets of paper may be needed, depending on the type of scene being searched. A numbering system should be used for the components of the grid. In setting up the grid, the lead investigator should first make a casual search of the exterior, while taking notes. The investigator should then repeat the process while reversing the direction of the search to note features overlooked during the initial inspection. Sample diagrams are included.