INEC's ABIS invalidates 2,780,756 ineligible voter registrations

AI system

System: Automated Biometric Identification System (ABIS)
Model: Not assessed
Release: Not assessed
Application developer: Not named in the sources
Role: Not assessed
Configuration: Not assessed
Inputs and outputs: Not assessed
Autonomy: Not assessed
Workflow: Biometric capture (fingerprints, face) at registration with a central de-duplication pass. Business rules defining ineligible entries applied after matching. Public display of the register for claims and objections.
Human oversight: Not assessed
Relation to AI: The figures come from INEC's own statements (the deployer) relayed by two Nigerian outlets, not from an audit. INEC's website could not be searched. ABIS's matching method, error rates and the share of invalidations due to biometrics versus business rules are not stated. BusinessDay's critique (registrants evading ABIS; 49.3% of invalidations from two regions) is included as a limit.
AI contribution: The figures come from INEC's own statements (the deployer) relayed by two Nigerian outlets, not from an audit. INEC's website could not be searched. ABIS's matching method, error rates and the share of invalidations due to biometrics versus business rules are not stated. BusinessDay's critique (registrants evading ABIS; 49.3% of invalidations from two regions) is included as a limit.

Outcome identifiers: Not assessed
Benefit: 2,780,756 registrations (22.6%) were identified as ineligible and invalidated
Category: Reduced Risk
Status: Not assessed
Beneficiary groups: Society. Organizations.
Beneficiaries: Not assessed
Reach: Not assessed
Distribution and access: Not assessed
Duration: Not assessed
Expected?: Yes
Costs and harms: Not assessed

Studies: Not assessed
Study design: Not assessed
Measurement: Not assessed
Setting and sample: Not assessed
Measures: 2,780,756 registrations (22.6%) were identified as ineligible and invalidated
Comparison: the raw Continuous Voter Registration data before ABIS cleaning
Results: Reference: 12,298,944 Nigerians successfully completed the registration as new voters. Result: the number of valid registrations (post-ABIS) is 9,518,188.
Additional value from AI: Not assessed
Limitations: Not assessed
Denominators: Not assessed
Materials for replication: Not assessed

Participants: Developer: Not named in the sources. Operator: Independent National Electoral Commission (INEC), Nigeria.
Jurisdictions: Operator: Nigeria.
Ownership and control: Not assessed
Dependencies: Not assessed
Cross-border connections: Not assessed
Geopolitical implications: Not assessed

Conditions for replication: Biometric capture quality adequate for matching. Independent audit of matching accuracy (absent here). Officers unable to bypass capture protocols.
Replication attempts: 1 follow-up entries. Benefit recurred: 1.
Later findings: 20 January 2023. A BusinessDay analysis argued that fake and underage registrants had nonetheless reached the final register and that invalidation rates were lopsided by region, a press critique rather than an official reversal.
Availability: Not assessed
Institutional decision: Not assessed
Grounds: Not assessed
Action and result: Not assessed
Success criterion: Not assessed

Assessed benefits: Society. Organizations.
Depth: Society: 3. Organizations: 2.
Reasons: Society: 2,780,756 ineligible entries (22.6% of new registrations) were removed from the register used for the 2023 general election, per INEC's chairman. BusinessDay disputes completeness and regional balance. Organizations: INEC obtained a cleaned register and identified 23 of its own officers for sanctions over multiple registrations.
Observed or intended: Not assessed
Rubric: Not assessed
Assessor and date: Not assessed
Alternative assessments: Not assessed
Fill: Independently reported

Kind: Not assessed
Related entries: Not assessed
Field: Electoral integrity / voter registration. Government.
Purpose: De-duplicate and validate biometric voter registrations (fingerprints and faces) to remove double, multiple, underage and fake entries from the national register.
Dates: Date basis unassessed: 2022 (precision unassessed). Updated: 21 October 2026.
Stage: Not assessed
Version: SHA-256: 5a044b42ea97…