By allowing a victim or suspect to wash their hands before CID's arrival, what types of evidence could be spoiled?

Allowing a victim or suspect to wash their hands before the arrival of the Criminal Investigation Division (CID) can spoil critical types of evidence, specifically DNA and gunshot residue (GSR).

DNA evidence can be derived from skin cells, blood, or any bodily fluids that may be present on a person's hands. Washing hands effectively removes these materials, which significantly hinders the ability to collect DNA evidence that could link them to the crime or help identify the victim.

Gunshot residue, which consists of microscopic particles created when a firearm is discharged, can also be washed away. If a suspect has fired a weapon and is allowed to wash their hands, the GSR evidence will be lost, preventing investigators from determining whether that individual had recently handled or discharged a firearm.

Both DNA and GSR are crucial in criminal investigations, as they can provide insight into the involvement of a suspect or victim in a particular incident. Therefore, it is essential for law enforcement to secure and preserve such evidence promptly to maintain the integrity of the investigation.