Those two men looking in the hole have regular clothes on. The way the one was shaking his clothes and brushing the sand off, right at the hole, hopefully it's not a problem!
from what I've seen of Az. cases of serious crimes, the jurors are usually very B & W minded, meaning, if they think you are guilty some dust thrown in the hole to sour the crime scene is not going to fly with them. They will find the person guilty more often then not, Forensics Files, CSI non-withstanding.