What are modified ignition sources?

Modified ignition sources refer to man-made items that require some form of assistance or enhancement to ignite. This could include products that are designed to produce flames or sparks when used correctly, such as lighters or certain types of matches. The term "modified" indicates that these sources may have undergone a change or improvement in their design or application that allows them to ignite combustible materials more easily or effectively.

This contrasts with the idea of non-flammable substances, which do not ignite at all, or typical household items that may not inherently be designed to serve as ignition sources. While treated sources that are deemed safer could theoretically be considered "modified," the focus is specifically on those items that require an external input for ignition. Understanding these concepts is crucial in fire investigations to determine the potential sources of ignition in fire-related incidents.