AFIS (Automated Fingerprint Identification System)
Definition
An automated system that compares a fingerprint query (typically a latent print from a crime scene) against a reference database to identify candidate matches. AFIS demographic effects, including higher false-match rates for female and African American subjects in some conditions, have been documented in operational FBI data (Science Advances, 2020).
- Core function
- Searches latent prints against a reference database and returns ranked candidate matches for human review
- What it stores
- Fingerprint minutiae representations (ridge characteristics and patterns)
- Known bias
- Higher false-match rates documented for female and African American subjects in some operational conditions
Common questions
What does AFIS actually do in a criminal investigation?+
AFIS searches a fingerprint from a crime scene (called a latent print) against a large reference database and returns a ranked list of candidate matches. The key point: AFIS does not make identifications on its own. A human examiner using ACE-V analysis reviews the candidates and makes the final call.
Can AFIS systems make mistakes on certain people?+
Yes. Research has documented that some AFIS systems produce higher false-match rates for female and African American subjects in certain conditions. These demographic disparities are real and have been noted in operational FBI data, so they matter in forensic practice.
What information does AFIS store about a fingerprint?+
AFIS databases store fingerprint minutiae representations - essentially the mathematical patterns and ridge details from fingerprints. This allows the system to quickly compare a query print against thousands or millions of stored records and rank likely matches by similarity.
Related terms
- Bozorth3
- The NIST open-source fingerprint minutiae matching algorithm distributed as part of the NIST NBIS toolkit. Rotation- and translation-invariant. Serves as the reference...
- Clearview AI
- New York company that built a face-recognition database of approximately 30 billion images scraped from public websites without consent; subject to BIPA...
- Cold-Case Hit
- An AFIS identification event where a crime scene latent previously returned as no identification (NI) matches against a ten-print record enrolled into...
- Daubert Standard
- The US federal evidentiary standard (Daubert v. Merrell Dow Pharmaceuticals, 1993) requiring that expert testimony be based on scientifically valid methods with...
- Disparate Impact
- A legal and statistical concept describing a policy or practice that has a disproportionate adverse effect on a protected group, regardless of...
- EU AI Act Art 10 (Training Data Requirements)
- Provision requiring that training, validation, and testing datasets for high-risk AI systems be relevant, representative, free of errors, and complete, with appropriate...
- False-Positive Rate (FMR)
- In biometric verification: the probability that a comparison of images of two different individuals is incorrectly declared a match. In forensic identification,...
- FBI NGI (Next Generation Identification)
- The FBI's biometric repository system, fully operational from 2015, replacing IAFIS. Contains over 175 million ten-print records, 30 million palmprint records, and...
- Fitzpatrick Scale
- A skin-tone classification system originally developed by dermatologist Thomas B. Fitzpatrick in 1975 (initially covering four types for UV response in phototherapy),...
- Gender Shades (2018)
- Study by Joy Buolamwini and Timnit Gebru published at FAccT 2018 that measured accuracy disparities in three commercial face-recognition APIs across intersectional...
- I-24/7
- Interpol's secure global police communications network connecting 196 member countries. Used by national fingerprint bureaus to submit searches against and receive candidates...
- IDENT1
- The UK national fingerprint database operated by the Home Office and managed by Idemia. Holds approximately 10 million ten-print records and a...
Explained in these topics
- AFIS Systems: IAFIS / NGI, NAFIS, Aadhaar, IDENT1 and InterpolA database and search system that stores fingerprint minutiae representations and returns a ranked candidate list when a query fingerprint is submitted. AFIS s...
- Bias and Disparate Impact in Face and Fingerprint MatchingAn automated system that compares a fingerprint query (typically a latent print from a crime scene) against a reference database to identify candidate matches....