What items can cause cross-contamination at a scene?

Cross-contamination at a fire scene primarily refers to the transfer of evidence or materials that can compromise the integrity of an investigation. Tools are significant in this context because they are often used to manipulate or interact directly with the physical evidence at a scene, such as debris or materials from various locations. If tools used by investigators are not properly handled or cleaned, residues, dirt, or other debris from one area can easily be transferred to another, leading to potential misinterpretation of evidence.

Digital cameras, while essential for documenting the scene, typically do not interact physically with evidence in a way that would cause contamination. Similarly, witness statements and fire reports are secondary forms of evidence; they rely on human recollection or documentation and do not directly affect the physical evidence at the scene. Therefore, while all listed items play a role in an investigation, tools are the primary concern regarding cross-contamination.