What type of information can witnesses provide during an investigation?

Witnesses play a crucial role in investigations by providing first-hand accounts of what they have directly observed. Facts observed by witnesses include specific details about the event, such as the time, location, and actions of individuals during the incident. This type of information is vital for investigators as it can help establish a timeline and context for the incident, leading to a clearer understanding of the circumstances surrounding a fire or explosion.

In contrast, speculative theories, heard rumors, and inferences from evidence do not hold the same weight as direct observations. Speculative theories and inferences can lead to bias and could cloud the investigation, while rumors are often unverified information that may not accurately represent what occurred. Focusing on facts observed ensures that the information gathered is reliable and can be substantiated, which is essential for building a credible case during an investigation.