Why is it important to brush the excess sand from the plaster casting

The correct answer is to have a better and complete view of the footprint, which is essential in a crime scene.

Explanation:

A footprint is essential when investigating a crime. Since fingerprinting is more common, and criminals may be aware of this and be more careful, they are not as careful with footprints, however.

That is why the coroners who are investigating the case must be very careful and be able to investigate these tracks well. When the footprint is visible the work becomes easier, but if the footprint is not (latent footprint) the work can become very complicated.

Therefore, researchers should brush the excess sand from the plaster casting.