Which form of evidence can be objectively tested and verified?

Physical evidence is the form of evidence that can be objectively tested and verified because it is tangible and can be subjected to scientific analysis. This includes items such as fingerprints, DNA, weapons, drugs, or any object that can be collected at a crime scene. The analysis of physical evidence often involves forensic techniques that can yield clear, measurable results, making it a reliable source of information in an investigation or court proceeding.

In contrast, witness testimony relies on human perception and memory, which can be subjective and influenced by various factors, including stress or bias. Expert opinion stems from specialized knowledge but remains subjective, as it is based on the interpretations of an individual with expertise rather than concrete, universally verifiable data. Character evidence is related to a person's traits and may not hold the same weight in terms of factual verification or objective analysis. Therefore, physical evidence stands out as the most reliable type for testing and verification in the context of law enforcement and legal proceedings.