What kind of evidence can be affected by a suspect washing their hands?

When a suspect washes their hands, the primary type of evidence that can be significantly affected is DNA and Gun Shot Residue (GSR). Both of these types of evidence are vital in criminal investigations, especially in cases involving violent crime or the discharge of firearms.

DNA is often collected from skin cells and other biological material that may be present on a suspect's hands. Washing hands can remove this vital biological evidence, making it more challenging to link a suspect to a crime scene or a victim. Similarly, Gun Shot Residue consists of tiny particles that can be deposited on a person's hands when they handle a firearm. Washing the hands can effectively eliminate these residue particles, which could demonstrate that a suspect recently fired a weapon.

The other options do not directly relate to the washing of hands in the same way. Electronic evidence typically refers to data stored on digital devices and remains unaffected by physical actions like washing hands. Physical items might include objects found at a crime scene, which are unrelated to a suspect's hand hygiene. Witness statements, while crucial, are not influenced by a suspect washing their hands, as these statements are based on personal accounts and are not physical or biological evidence.