Direct versus circumstantial evidence

DEFINITIONS: Evidence that links directly to material facts is direct evidence; evidence that requires inferences to link it to material facts is circumstantial evidence.

SIGNIFICANCE: Most forensic evidence collected from crime scenes is circumstantial evidence in its relationship to the material issue of whether suspects are guilty of the crimes charged, although such evidence may be direct evidence of lesser material facts of the crimes.

Direct and circumstantial evidence of a series of material facts related to a crime builds the case and leads to an outcome of guilt or innocence. In obtaining evidence, forensic scientists rely on Locard’s exchange principle, which states that every contact of an individual with another person, place, or object results in an exchange of materials. The work of applies scientific disciplines to the law and encompasses the discovery, gathering, investigation, preservation, examination, comparison, documentation, and quality control of materials found at the scenes of crimes. The work of forensic science enables investigators to use the or the absence of particular physical evidence at crime scenes to develop associations that prove or disprove material facts as those facts relate to the crimes.

If no such evidence is available, investigators would turn their attention more closely to circumstantial evidence. Suspicion might then fall on a company employee who knows the combination to the safe, who shortly after the robbery quit his job and left the area, and who cannot account for his whereabouts at the time of the theft. None of these facts would directly link the employee to the crime, but in combination such circumstantial evidence could be used to build a case against him.

Direct evidence is evidence that links directly to material issues in a case; it may take the form of testimony, video or audio recordings of the events that took place, or of the suspect. Fingerprints also may be direct evidence of material facts. The fact finder (judge or jury) does not have to infer anything from this evidence, as the evidence is considered to speak for itself. For example, a witness testifies that he saw the strike the victim. The relates directly to the material fact that the suspect struck the victim. A video surveillance tape showing that the suspect struck the victim would also be direct evidence relating to the material issue of the suspect’s guilt or innocence.

Direct evidence may link directly to a lesser material fact but not directly to the material issue of guilt or innocence. For example, a fingerprint found at a is direct evidence that a particular person was at the crime scene at some point in time. However, it is not direct evidence that the person was at the crime scene at the time the crime was committed or that the person committed the crime. The fingerprint evidence does not directly prove guilt or innocence. A photograph taken by a passenger on a passing tourist bus that shows a suspect entering a bank that was robbed may be direct evidence that the suspect was at the crime scene, but the same evidence would be circumstantial evidence that the suspect robbed the bank.

Circumstantial evidence does not establish proof in a direct sense. It requires the drawing of inferences between the evidence and a material issue before a conclusion is reached. For example, the material issue may be that the suspect struck the victim with a baseball bat. A date-stamped credit card receipt for the purchase of a baseball bat may be direct evidence that the suspect bought the bat, but it is indirect, or circumstantial, evidence that the suspect struck the victim with the bat. The receipt directly proves one fact (the purchase), but it does not directly prove the other fact (the suspect struck the victim with a baseball bat). With circumstantial evidence, the fact finder must infer any number of things to link the suspect to the material issue of guilt or innocence. The majority of forensic evidence found at crime scenes is circumstantial evidence as it relates to the material issue of suspect guilt or innocence because inferences must be made to link the evidence to guilt or innocence.

Direct and circumstantial evidence may also be found at secondary scenes of crimes—other locations where evidence connected to crimes are discovered. For example, a piece of jewelry found on a body in a shallow grave may contain a fingerprint that can be direct evidence that a suspect handled the jewelry of the deceased, but it is circumstantial evidence that the suspect had involvement with the victim’s death. A fiber from a victim’s clothing found in the home of a suspect may be direct evidence that the suspect had contact with the victim’s clothing, but it would be circumstantial evidence that the suspect killed the victim. In each of these examples, one must infer other actions from the indirect evidence to reach a conclusion of guilt or innocence.

Courts in the United States make no distinction between direct and circumstantial evidence in terms of importance toward proving guilt or innocence. In most of the fifty states, evidence in court cases falls under the guidelines of the Federal Rules of Evidence, which specify all instances in which evidence is relevant (pertaining to the case at hand), probative (likely to aid a fact finder in determining truth), and admissible (obtained under proper legal sanctions) to establish the facts of a case. Relevance is important in terms of whether a piece of evidence will be seen or heard by the court and in terms of how the evidence relates to the material issues of the case, but a determination of whether evidence is direct or circumstantial is not pertinent to the determination that the evidence is relevant and admissible at trial.

Direct evidence and circumstantial evidence hold equal weight in a court of law. Likewise, from a forensics point of view, evidence is evidence. Each piece of evidence serves to build the associations that prove or disprove material facts related to a crime.

Bibliography

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"Circumstantial Evidence." Cornell Law School, Jan. 2022, www.law.cornell.edu/wex/circumstantial‗evidence. Accessed 14 Aug. 2024.

Genge, N. E. The Forensic Casebook: The Science of Crime Scene Investigation. New York: Ballantine, 2002.

Giannelli, Paul C., Albert J. Weatherhead III, and Richard W. Weatherhead. Understanding Evidence. 2d ed. Albany, N.Y.: LexisNexis/Mathew Bender, 2006.

"Law 101: Legal Guide for the Forensic Expert." National Institute of Justice, 7 Aug. 2023, nij.ojp.gov/nij-hosted-online-training-courses/law-101-legal-guide-forensic-expert/trial/relevancy-evidence. Accessed 14 Aug. 2024.

Pentland, Peter, and Pennie Stoyles. Forensic Science. Philadelphia: Chelsea House, 2003.

Platt, Richard. Crime Scene: The Ultimate Guide to Forensic Science. New York: Dorling Kindersley, 2003.

Sapse, Danielle S. Legal Aspects of Forensics. New York: Chelsea House, 2006.