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I think in India iris scans are used in addition to fingerprint as biometric markers. Doesn't cover all cases but more robust than just relying on a finger or a

• captn3m0 5y ago
  No, Iris scans are used in the Aadhaar ecosystem during enrollment. But for authentication usecases (such as ration disbursement) - it is almost exclusively OTP/fingerprint verification. Iris scans can be used, but are rarely used in practice anywhere except enrollment due to the higher cost of devices, the "creepyness factor", and speed of usage.