Chief Constable of Thames Valley Police

4709 Accredited to ISO/IEC 17025:2017 Schedule of Accreditation issued by United Kingdom Accreditation Service 2 Pin e Tre e s, Ch e rts ey La n e , Sta ine s -u po n-Tha me s , TW18 3 HR, UK Chief Constable of Thames Valley Police Issue No: 034 Issue date: 01 October 2025 Testing performed by the Organisation at the locations specified Assessment Manager: TVR Page 6 of 10 Materials/Products tested Type of test/Properties measured/Range of measurement Standard specifications/ Equipment/Techniques used Location Code FRICTION RIDGE DETAIL Forensic Analysis (cont’d) Finger and Palm (Non-Cadaver) Analysis, comparison, and evaluation of Friction Ridge Detail as outlined below for the purpose of: - Criminal Investigation - Elimination Databases A Marks - CSI/FEL Recovered Lifts from physical scenes - CSI/FEL Photographs of marks from physical scene - Fingerprint Enhancement Laboratory Recovered Lifts from physical items - Fingerprint Enhancement Laboratory Photographs of marks from physical items Comparison with Ten Prints - Ink - Powder - Livescan Documented in house procedures using visual manual techniques: - Fingerprint glass - Reference collections - Comparators (optical) - High Quality Printer A Ten Prints - Ink - Powder - Livescan Comparison with Marks - CSI/FEL Recovered Lifts from physical scenes - CSI/FEL Photographs of marks from physical scenes - Fingerprint Enhancement Laboratory Recovered Lifts from physical items - Fingerprint Enhancement Laboratory photographs of marks from physical exhibits Documented in house procedures using visual manual techniques: - Fingerprint glass - Reference collections - Comparators (optical) - High Quality Printer A Opinion and Interpretation The evaluation of the significance of any matching and non-matching features between sources of friction ridge detail as outlined in the above scope of accreditation. Documented In-House methods using - Personal experience - database A

4709 Accredited to ISO/IEC 17025:2017 Schedule of Accreditation issued by United Kingdom Accreditation Service 2 Pin e Tre e s, Ch e rts ey La n e , Sta ine s -u po n-Tha me s , TW18 3 HR, UK Chief Constable of Thames Valley Police Issue No: 034 Issue date: 01 October 2025 Testing performed by the Organisation at the locations specified Assessment Manager: TVR Page 7 of 10 Materials/Products tested Type of test/Properties measured/Range of measurement Standard specifications/ Equipment/Techniques used Location Code MARKS AND IMPRESSIONS Forensic Analysis (cont’d) Footwear mark (physical or image) Screening of suspect footwear by pattern type and size Documented in-house method (FWU-P-TEC-1) using: - Visual examination A Enhancement of footwear marks recovered from scenes. Documented In-House methods (FWU-P-TEC-2, FWU-P-TEC-3, FWU-P-TEC- 7) using: - Imaging (photo/GL scan / Flat bed scanner) - Lifting (ESLA/Gel) A Production of test marks from suspect footwear Documented In-House method (FWU-P-TEC-12) using: - Powdering methods (static and dynamic) - Paint and acetate sheets (dynamic) - Printscan A Footwear mark (physical or image) (cont’d) Assessment, Comparison and evaluation of footwear with scene marks Documented in-house methods (FWU-P-TEC-12) using: - Visual examination A Opinion and Interpretation The evaluation of the significance of any matching and non-matching features between the footwear scene impression and reference/control footwear marks Documented In-House method (FWU-P-TEC-4) using - Personal experience - database A