ESR scientists are involved in the case from crime scene to court, which includes the following post-investigation activities.
Statistical Interpretation of Evidence
Many investigations involve determining whether or not two samples have a common origin (eg DNA from a particular person and DNA from a blood stain). A distinction is conclusive: the samples cannot have a common origin. Non-distinction leaves alternative explanations: (i) non-common origin but coincidental agreement; or (ii) actual common origin. ESR's developed databases and statistical interpretation techniques permit objective assessment of the significance of the evidence of association.
Expert Witness - presentation in court
The culmination of examining a case is the presentation of your evidence in court. Forensic scientists, through their qualifications and training, are classed as expert witnesses. This means that they can give both evidence of fact and opinion. Normally a ‘lay’ witness is only allowed to give evidence of fact. A good expert witness is impartial and able to explain to the court scientific concepts in an articulate and understandable manner.