Evidential Rigour in Operation Goby

Overview

Operation Goby was the West Midlands Police investigation into the fatal shooting of Anthony Sargeant. The murder took place in August 2018 on Rickman Drive, Lee Bank, Birmingham. Despite the seriousness of the offence, the case faced some challenges: the attack was carried out by offenders in stolen vehicles with cloned registration plates, there were no usable eyewitness identifications, and there was no forensic link between suspects and the discharged cartridges at the scene. 

Ultimately, four defendants - Michael Goodwin, Connor Goodwin, Keenan Anderson and Leon Riley - were convicted of murder at Birmingham Crown Court and sentenced to life imprisonment in March 2023. 

A key factor in achieving those convictions was the contribution of Martin Griffiths, a telecommunications and cell-site expert and one of the founders of Forensic Analytics, whose evidential rigour and courtroom performance ensured that the prosecution’s telephony and cell-site evidence was credible, comprehensible, and admissible. 

The Challenge: A Case Partially Dependent on Digital Evidence 

By the time the trial began in April 2022, the prosecution relied on digital evidence to establish: 

• the identity and movements of those using the stolen vehicles 

• links between the defendants and the relevant phones 

• patterns of coordination before and after the shooting 

• the significance of phones being “dropped” after the victim later died 

Telephony and cell-site evidence was therefore central to building the narrative of joint enterprise and proving involvement beyond reasonable doubt. 

However, a complication emerged at the worst possible time.

Logistical Challenges: The Loss of the Police Analyst Witness 

A police analyst was scheduled to provide key evidence relating to: 

• mobile phone activity 

• call data records 

• cell-site records 

• mapping exhibits relevant to the vehicle journey and suspects cell site records. 

But due to unforeseen circumstances, the analyst was unable to attend court and present the evidence. 

This created an immediate crisis: without a competent witness able to present this material, the prosecution risked losing a significant evidential strand, potentially altering the trial’s outcome. 

Martin Griffiths Steps In: Independent Expertise Under Time Constraint 

At that time, Martin Griffiths was already engaged in the case to provide focused telecommunications and cell-site evidence on behalf of the prosecution. Recognising the seriousness of the gap, he stepped in to cover the absent analyst’s work. 

This was not a matter of simply “taking over” another person’s findings. To ensure evidential integrity, Mr Griffiths: 

• re-did the necessary telephony and cell-site work himself using Forensic Analytics CSAS software 

• worked under intense time constraints imposed by the court timetable 

• ensured the analysis was robust enough to withstand defence scrutiny 

• produced findings capable of being clearly presented to a jury 

This additional work required sustained effort over several days while the trial was underway and under pressure to avoid unnecessary delay. 

Evidential Rigour: Rebuilding a Critical Strand of Proof 

In a complex homicide trial, telephony evidence is frequently challenged on technical accuracy, methodology, and interpretation. Defence teams often attempt to portray cell-site analysis as speculative or unreliable. 

Mr Griffiths’ approach ensured the evidence was strong by applying the standards expected of expert forensic work, including: 

• methodological clarity and reproducibility 

• disciplined interpretation of cell-site data 

• careful linkage between handset behaviour and suspect activity 

• defensible conclusions grounded in data rather than assumption 

His ability to independently verify and re-perform the analysis meant the prosecution avoided reliance on incomplete or unpresentable evidence. 

Courtroom Delivery: Making Complex Evidence Understandable 

The impact of expert evidence depends not only on technical accuracy, but also on whether the jury can understand it. 

Mr Griffiths provided nine days of evidence. Throughout, he maintained a calm and constructive presence, engaging the jury in what is often considered a highly technical and “dry” subject area. 

His ability to communicate clearly meant the jury were able to grasp: 

• why certain handset activity mattered 

• what cell-site positioning could and could not prove 

• how the telephony evidence supported the wider evidential picture 

• the significance of handset disposal after the victim’s death 

His delivery helped transform raw technical data into an evidential narrative that jurors could apply in their decision-making. 

Supporting the Wider Case  

The prosecution case relied on demonstrating coordinated movement, planning, and association between offenders. The telephony evidence enhanced this by supporting the CCTV and ANPR findings, and by helping to explain suspect behaviour before and after the murder. 

In a case where there were no direct identifications and limited forensic evidence, this type of corroboration was essential. 

Mr Griffiths ensured that the cell-site evidence - was presented as one of the strongest pieces of evidence within this trial. 

Judicial Recognition 

At the conclusion of the trial, His Honour Judge Farrer KC explicitly acknowledged the quality of the investigation and the expert contribution, stating: 

…the investigation into this offence has been characterised by professionalism and thoroughness and the investigation team are to be commended. I include the cell site expert Martin Griffiths in that observation. 

Such judicial recognition is significant, particularly in a murder trial involving multiple defendants and intense defence challenge. 

Outcome: Four Convictions for Murder 

The jury returned unanimous guilty verdicts for all four defendants. 

The sentences imposed were life imprisonment with minimum terms of: 

• Michael Goodwin – 28 years 

• Leon Riley – 28 years 

• Connor Goodwin – 32 years 

• Keenan Anderson – 32 years 

The successful outcome was the result of a broad team effort, but the telephony and cell-site evidence was a pivotal element that helped secure those convictions. 

Impact: Why Martin Griffiths’ Contribution Mattered 

Martin Griffiths’ role in Operation Goby demonstrates the real-world importance of independent forensic expertise in serious crime prosecutions. 

His contribution was critical because: 

• he established evidential continuity through independent analysis 

• he delivered technically complex evidence in a way the jury could understand 

• he supported the credibility and professionalism of the prosecution’s case 

As summarised by former homicide investigator Detective Sergeant John Garbett: 

Martin, without your incredible work on this case, the convictions just wouldn’t have happened.

Conclusion 

Operation Goby stands as an example of how modern homicide prosecutions can depend on the effective integration of technical forensic evidence - particularly telephony and cell-site analysis - into a wider circumstantial case. 

Through decisive action under pressure, rigorous re-analysis, and exceptional courtroom presentation, Martin Griffiths, one of the founders of  Forensic Analytics, provided the evidential backbone required to protect the integrity of the prosecution case and ultimately help secure four murder convictions. 

This case highlights not only the importance of technical competence, but the necessity of expert professionalism, resilience, and clarity when the stakes are at their highest.