What object is suggested to indicate size in crime scene photographs?

Using a ruler in crime scene photographs is crucial for indicating size because it provides a clear and universally understood reference for measurements. When a ruler is included in a photograph, it allows individuals reviewing the photographs later to accurately gauge the dimensions of objects in the scene. This is particularly important for forensic analysis, where precise measurements can be critical in understanding the spatial relationships and scale of evidence.

While other objects like a tape measure and a standard notebook could also provide context, they may not be as effective in a still photograph. A tape measure would typically need to be held in place for measurement, and its length may not be as easily interpreted as that of a ruler. A pencil or a notebook could serve as a relative size reference but lacks the uniformity and precise measurement capability that a ruler offers. Therefore, incorporating a ruler into crime scene photography is a standard practice to ensure clarity and accuracy in depicting sizes of evidence and relevant objects.