Randomly acquired characteristics (RACs)
Post-manufacture features (cuts, gouges, embedded material, crack patterns) unique to a specific shoe sole or tyre; the highest-level individualising features in impression comparison.
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Related terms
Class characteristics (footwear)Dental stoneESLA (Electrostatic dust-print lifter)Perpendicular camera alignmentR v. Mohan (1994) + White Burgess Langille Inman (2015)SICAR (Shoeprint Image Capture and Retrieval)Snow-print waxSubclass characteristics (footwear)SWGTREADTracking Evidence (TE) databaseTreadmate