Fingerprint Patterns - Double Loop Whorls
Fingerprint Patterns - Double Loop Whorls
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Technical Definition: A double loop whorl consists of two separate and distinct loop formations with two separate and distinct shoulders and two deltas.
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| Image #1 | Image #2 | Image #3 |
The technical definition for this pattern type is fairly straight-forward. There must be to separate and distinct shoulders for each core. If you look at Images #1 and Image #2 you can clearly see that there appears to be two separate "loops" inside of this whorl. In most cases this means that the pattern will most likely be a double loop whorl but not always.
The problems lies in the "separate and distinct" shoulder requirement sometimes. If you look at Image #3 you can clearly see that there are separate and distinct shoulders created and shown in the red and blue. The shoulders of each "core" must comprise separate lines. This means that they can't be the same obviously.
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Image #4 |
By using a little creative editing I have now changed Image #3 and the way it appears in Image #4. The significant change is that I have edited this image so that both apparent shoulders (cores) now use the same line (indicated in red). Because they both now use the same line to form the shoulders of each core this is no longer a valid double loop whorl.
If there is a problem with identifying a double loop whorl it is probably because of the failure to either identify that there is a separate and distinct shoulder to each core. If the shoulder is formed by the same recurving line then it is not valid. Another issue comes into play and that is if the core or shoulder is actually valid itself.
A double loop whorl whorl in NCIC Classification is denoted as a "D" with the second number, which is either "I", "O" or "M" coming from the whorl tracing. In the case shown above with the caption "Image #2" this is a Double Loop Whorl with an Inner Tracing and would be denoted in NCIC code as "DI".