Table 3.
Process of observer-based forensic gait analysis.
| Description |
The Netherlands |
The United Kingdom |
Denmark |
| Orientation phase: video footage quality assessment: frame rate, viewpoint, walking direction, resolution | Exp0 (police) and/or exp1 + 2 | If possible by exp0 | Exp0 (police) and exp1, if needed also by exp2 |
| Preparation phase: police instruction for reference footage | If needed (prior to interrogation) | If needed (in custody) | If needed (when brought in for interrogation) |
| Research phase: analysis and comparison of questioned (QF) and reference footage (RF) | QF by exp1 and exp2 independently | QF by exp1 and exp2 independently | QF and RF by exp1 |
| RF by exp1 and exp2 independently | RF by exp1 and exp2 independently | Discussing/modifying the assessment made by exp1 with exp2 | |
| Comparison based on scores (and notes) | Comparison based on notes | Comparison based on notes | |
| Pooling 2 experts results | – | – | |
| Result program (Matlab) | – | – | |
| Reporting and evaluation phase: reporting results and optionally further research | Writing report | Writing report | Writing report |
| – | Independent verification of report by exp2 | Present + discuss case exp1 with exp2 | |
| Revision of report, if needed | Revision of report, if needed | Revision report, if needed | |
| Submission report (prosecutor/barrister) | Submission report (police/defence) | Submission report (police) | |
| Attend court (on request of prosecutor or defence) | Attend court (on request of prosecutor or defence) | Attend court (on request of prosecutor) | |
| Follow-up research, if needed | Additional research, if needed | – |
Exp: expert. Exps 1 and 2 are gait analysts. Exp0 is an image analyst not involved in the gait analysis; –: no data.