These types of evidence are critical in determining the facts concerning the crime scene because they can provide information that is not visible to the naked eye. For example, trace evidence can show how the victim and the perpetrator interacted, and firearm residue can show if someone was in the vicinity of a gun when it was fired. DNA evidence can identify the perpetrator of a crime, even if the perpetrator was careful not to leave any other type of evidence behind.

Here are some additional examples of evidence that is often invisible to the naked eye:

• Fingerprints: Fingerprints are often invisible to the naked eye, but they can be made visible using a variety of techniques, such as dusting with powder or using chemicals. Fingerprints can be found on a variety of surfaces, including skin, glass, metal, and plastic.
• Footprints: Footprints can also be invisible to the naked eye, but they can be made visible using a variety of techniques, such as dusting with powder or using chemicals. Footprints can be found on a variety of surfaces, including dirt, concrete, and carpet.
• Lip prints: Lip prints are also often invisible to the naked eye, but they can be made visible using a variety of techniques, such as dusting with powder or using chemicals. Lip prints can be found on a variety of surfaces, including drinking glasses, cups, and bottles.

These types of evidence can be very important in determining what happened at a crime scene, as they can link the perpetrator to the scene or to the victim. By processing these types of evidence, law enforcement can often solve crimes that would otherwise go unsolved.