Analysis Phase of ACE-V
Procedural Steps:
The Analysis phase is applied with the objective of reducing the friction ridge features to their basic components. This phase involves a thorough assessment of the Properties & Attributes of the friction ridge features in the unknown latent print impression. The examiner performs qualitative and quantitative assessments of Level 1, Level 2 and Level 3 details. An assessment for the causes / factors of distortion and their effect upon the latent print is performed. An assessment of the degree of clarity present in the impression is made. Finally, impression deposition influences such as substrate (surface) type, matrix/residue, direction of touch and pressure are determined. The examiner ultimately decides if the friction ridge details depict sufficient quality and quantity of information to warrant a comparison.
Scientific Method / Daubert Issues Addressed:
This is the 'Observation & Description' stage of the Scientific Method. It involves collecting a series of observations to gain an understanding about an observable group of events (in our case - friction ridge features, their appearances and the influences that act upon them).
Study of the Properties and Attributes of the friction ridge features provides meaningful insight into the Hypothesis which will later be formed (in our case; that correspondence in friction ridge features can be used as the basis to effect Identifications). This Hypothesis is then tested, to determine if it can be falsified.
Additional Insights: (Click on)
Properties & Attributes
Measuring Numerical Value vs. Assessed Properties of Friction Ridge Features
Level 1
Level 2
Level 3
Clarity
Distortion
Scientific Method
Copyright© 2010 Chesapeake Bay Division - International Association for Identification (IAI)
The Analysis phase is applied with the objective of reducing the friction ridge features to their basic components. This phase involves a thorough assessment of the Properties & Attributes of the friction ridge features in the unknown latent print impression. The examiner performs qualitative and quantitative assessments of Level 1, Level 2 and Level 3 details. An assessment for the causes / factors of distortion and their effect upon the latent print is performed. An assessment of the degree of clarity present in the impression is made. Finally, impression deposition influences such as substrate (surface) type, matrix/residue, direction of touch and pressure are determined. The examiner ultimately decides if the friction ridge details depict sufficient quality and quantity of information to warrant a comparison.
Scientific Method / Daubert Issues Addressed:
This is the 'Observation & Description' stage of the Scientific Method. It involves collecting a series of observations to gain an understanding about an observable group of events (in our case - friction ridge features, their appearances and the influences that act upon them).
Study of the Properties and Attributes of the friction ridge features provides meaningful insight into the Hypothesis which will later be formed (in our case; that correspondence in friction ridge features can be used as the basis to effect Identifications). This Hypothesis is then tested, to determine if it can be falsified.
Additional Insights: (Click on)
Properties & Attributes
Measuring Numerical Value vs. Assessed Properties of Friction Ridge Features
Level 1
Level 2
Level 3
Clarity
Distortion
Scientific Method
Copyright© 2010 Chesapeake Bay Division - International Association for Identification (IAI)