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Updated: May 31, 2025

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Cell site analysis; testing understanding via internal consistency checks.

Matt Tart1, Robert Moore1

  • 1CCL Forensics, UK.

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|January 24, 2025
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Summary
This summary is machine-generated.

This study offers methods for Cell Site Analysis experts to use casework data for quality assurance, improving the understanding of uncertainties in analyses when real-world data access is limited.

Keywords:
CDRCall Data RecordCell Site AnalysisDigital ForensicsEncochatGeo dataGprsSurveyUncertainty

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Area of Science:

  • Forensic Science
  • Telecommunications Engineering
  • Data Analysis

Background:

  • Access to practitioner-generated Call Data Records (CDRs) is restricted in the UK, limiting validation exercises for Cell Site Analysis Expert Witnesses.
  • Ground Truth Data (GTD) is crucial for validation but often unavailable for real-world testing of analytical methods.
  • Existing methods may not fully address uncertainties in analyzing CDRs and other forensic data.

Purpose of the Study:

  • To outline methods for Cell Site Analysis experts to use casework material for quality assurance.
  • To improve the reliability of analyses by detecting issues in the understanding of uncertainties.
  • To provide a deeper layer of quality assurance for forensic analyses.

Main Methods:

  • Reviewing properties of casework material in parallel with ongoing casework assessment.
  • Analyzing four case examples to test the reliability of understanding uncertainties.
  • Examining Call Data Record GPRS time uncertainties, survey result reliability, and Encrochat "geo" data reliability.

Main Results:

  • Casework material can be utilized to identify potential issues in understanding analytical uncertainties.
  • The proposed methods enhance the internal quality assurance of Cell Site Analysis.
  • Demonstrated application in assessing uncertainties related to GPRS timing, survey data, and encrypted device data.

Conclusions:

  • Casework review offers a viable supplementary method for quality assurance in Cell Site Analysis.
  • Improved understanding of uncertainties enhances the reliability of expert witness testimony.
  • These methods augment, but do not replace, validation using Ground Truth Data.