ASIS International (ASIS) Professional Certified Investigator Practice Exam

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What type of fingerprint is characterized by having two deltas?

Whorl
Loop
Arch
Plain

The correct answer is: Whorl

A whorl fingerprint is characterized by having two deltas. In forensic science, deltas in fingerprints are points where ridge lines diverge, and their presence is a key distinguishing feature of whorls. Whorls can exhibit various patterns, but their defining attribute of having two distinct deltas sets them apart from other fingerprint types. Loops, on the other hand, have only one delta, while arches do not have any deltas at all. The plain variation of whorls is essentially a specific configuration that maintains the two-delta characteristic. Understanding these distinctions is crucial for classification and analysis in forensic investigations, making the identification of fingerprints a fundamental skill for professional investigators.