North Carolina Basic Law Enforcement Training (BLET) State Practice Exam

Which of the following is NOT one of the three basic fingerprint patterns?

1. Arch

2. Loop

3. Whorl

4. Curve

The correct answer is: Curve

The correct answer is based on the fundamental classification of fingerprint patterns used in forensic science. Fingerprints are primarily categorized into three basic patterns: arches, loops, and whorls. Each of these patterns consists of specific characteristics that allow forensic experts to identify and classify fingerprints effectively. Arches are characterized by ridge lines that enter from one side and exit out the opposite side, forming a wave-like pattern without any significant core. Loops, on the other hand, have ridges that enter from one side, curve around, and exit from the same side, creating a distinct loop shape. Whorls display circular or spiral ridge patterns that create distinct concentric circles and are usually categorized into multiple subtypes based on the number and arrangement of their core features. In contrast, "Curve" does not represent a commonly accepted category in fingerprint classification. While curves may appear in the formation of a fingerprint, they do not constitute a recognized pattern type within the three basic classifications used in practice. This distinction highlights why "Curve" is the answer that does not belong in the context of standard fingerprint patterns.