The role of the expert witness is of providing expert opinion that helps answer the significant questions in a case. The opinion is the result of interpretation of factual observations.

  • We evaluate the probability of the evidence, not the probability of the proposition: our certainty about the truth of each proposition.
  • To manage uncertainty, we use probability theory. Probabilities are therefore conditional.
  • What we can say is the scientific evidence. It is Court’s mission to consider the evidence of the expert.
  • We recognize the non-scientific evidence from scientific evidence.
  • The evaluation of scientific results in forensic science moves on with the three principles of forensic interpretation.
  • Interpretation of the strength of scientific findings: robust, transparent so a non-scientist can understand what we say, not biased and in a logical framework construction.
  • The scientific evidence must be interpreted within a framework of relevant information (information, our knowledge, data used).
  • Interpretation by considering at least two propositions.
  • Address questions!
  • What is the probability of the evidence given the propositions.

Forensic science can be described as the application of scientific method to help answer important questions in criminal and civil justice process.

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