ASIS International (ASIS) Professional Certified Investigator Practice Exam

The key feature of a loop fingerprint is that it contains one delta. In fingerprint classification, deltas are the triangular regions formed by the meeting of ridges. A loop fingerprint pattern typically flows in a way that creates a single delta, which is critical for identification and classification purposes. This distinguishes loop fingerprints from whorls and arches, which have different characteristics regarding the number of deltas.

Loops are one of the three major fingerprint patterns, and their presence of a single delta makes them easier to identify and categorize in forensic investigations and biometric systems. Understanding this characteristic can aid in the analysis and comparison of fingerprints during investigations.