Q: What is the difference between biometrics and forensics?

While both biometrics and forensics involve human recognition, biometrics is typically applied using automated techniques to the pre-event situation application, such as gaining access to sensitive information or to a secured facility. Forensic applications typically occur after a crime has occurred, and may not use fully automated methods. Forensic methods are often used to assist in the adjudication (legal) process. Forensics usually requires days of processing (versus seconds for biometrics) and are held to much higher accuracy requirements.
Source - Biometrics.gov

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