Marking "not to scale" on a crime scene sketch is important because:

Marking "not to scale" on a crime scene sketch serves a crucial purpose in conveying the nature of the sketch as a representation rather than a precise blueprint. This distinction is essential because it informs anyone viewing the sketch that the proportions and distances depicted may not accurately reflect the actual measurements of the crime scene.

Unlike a blueprint that is drawn to scale and provides exact dimensions, a crime scene sketch is primarily intended to provide an overview of the scene and illustrate relationships between various elements, rather than to serve as a literal map. This is particularly relevant in legal contexts where evidence is reviewed, as it sets appropriate expectations regarding the accuracy of spatial relationships and helps prevent misinterpretation based on assumed precision.

By clarifying that the sketch is not to scale, it protects the integrity of the investigation and is a crucial element in presenting evidence in court, ensuring that all parties understand the sketch's limitations. This understanding is vital for investigators, attorneys, judges, and juries who may rely on the visual representation of the crime scene during legal proceedings.