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FARO® Knowledge Base

Example Predicate Questions to Qualify 3D Scan Data for Use in Judicial Cases and Law Enforcement Investigations

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Overview

Here are some example questions you may want to consider when presenting scan data as part of evidence or testimony in a judicial case or a police investigation. The answers to questions like these may help validate the authority, authenticity, and accuracy of any analysis or conclusions based on scan data that may apply to a case.

Scanner 

  • Has the FARO® Laser Scanner been tested in scientific settings and public safety settings?
  • Is FARO data peer reviewed?
  • Is there a known error or accuracy produced by the FARO 3D Laser Scanner?
  • Is there acceptance within the scientific community?
  • Is this an accurate representation of what you witnessed or saw at the scene in question?

Case

  • What examinations were done by you about this case?
  • What were the results of this examination?
  • Did you write a report regarding the results of this examination?
  • What did that examination entail?
    • Photographs
    • Notes
    • Video
    • Measurements

Measurement

  • How did you obtain measurements?
  • What instrument was used to obtain these measurements?
  • Is the instrument calibrated to international standards?
  • When was the last time the instrument was calibrated?
  • Do you maintain calibration certificates?
  • What is the measurement error rate of the instrument?
  • What is the measurement standard deviation of this specific project / case?
  • Have you or are you able to generate a report documenting the standard deviation?
  • Is the raw data obtained from the instrument maintained?
  • How is the raw data secured?
  • What is your data security protocol?
  • Was a 3D reconstruction generated from the measurement data?
  • What software was used to generate the reconstruction?
  • What specific measurements were obtained from the raw data that aided your reconstruction of events?
  • Are your results reproducible?
  • What training do you have relating to this instrument?
  • How many scenes have you used this instrument in?
  • How many reconstructions have you done using this instrument?

Shooting Incident Reconstruction/Bloodstain Pattern Analysis/Momentum/Crush

  • Were you able to conduct an analysis utilizing the 3D data?
  • What software did you use to conduct the analysis?
  • Are there any validation studies regarding utilizing the software analysis?
  • What were the results of that analysis?
  • Are you able to produce a report specific to the analysis you conducted?
  • Are the results of the analysis report able to be verified based on the scientific method?

 

Keywords:

accuracy, testimony, evidence, error range, accreditation, accredited, certification, certified, police investigation, courtroom evidence