2022 09 Distortion Interpretation & Feature Distribution - Mesa, AZ



September 12 – 16, 2022


0800 – 1700 Monday – Thursday
0800 – 1200 Friday


Mesa Police Department
Fiesta Substation
1010 W. Grove Ave.
Mesa, AZ 85210

Mesa PD Contact

Maureen Smith
Email: maureen.smith@mesaaz.gov

Instructor Contact

Alice White
Email: Alice@EvolveForensics.com
Mobile: 702.769.9469

Hotel Information:

DoubleTree by Hilton Phoenix Mesa located at 1011 West Holmes Ave, Mesa, AZ 85210. The room rate will be $137.00 + occupancy tax at 14.27%. This rate does not include the continental breakfast. There are currently 15 rooms being held for this block and students can use this link to make their reservations: www.my-event.hilton.com/meswhdt-dcm-b8a700e4-dec4-4a8e-93cc-35223e5d9c1c/  The hotel is within reasonable walking distance to the training facility.

Download Class Flyer: Distortion Interpretation & Feature Distribution

Landmark-based morphometrics are quantitative methods used by scientists to study form, and variation in form, within plant and animal species. This is essentially the same method used, albeit more qualitatively, during the examination of friction ridge impressions. A key difference for friction ridge examiners is that this method must be applied along two dimensions: 1) distribution of friction ridge features within the human population (inter-source variation) and 2) variation in the recording of friction ridge skin from the same person (intra-source variation). Inter-source variation establishes the diagnosticity of the feature for establishing search parameters and determining identity. Intra-source variation establishes whether the attributes of a feature are within tolerance for having come from the same source skin.

This 4 ½ day workshop will link together the biological aspects of the skin (“morpho” of morphometric) with the geometry of the impressions of the skin (“metric” of morphometric). The estimated distributions of the features within the population will be evaluated using published research and exploring the degree of symmetry among twins and within individuals (bilateral symmetry). Assessing variation in appearance will take place along two lines of inquiry 1) skin variation due to time (e.g., aging, injury, disease) and 2) variation in appearance due to distortion during the recording of the skin on a surface.  Attendees will be able to make their own collection of distortion videos to reinforce the distortion concepts. Practical exercises will challenge the examiners to consider which features and their attributes are being compared and weighted and which distortion factors are most relevant for understanding the variation in appearance between two impressions that originated from the same source.

This workshop replaces and includes the content from Analysis of Distortion in Latent Prints.

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