Answer:
Biometrics
Explanation:
Biometrics -
It refers to the method to detect any individual on the basis of face , iris , fingerprints , voice and handwriting , is referred to as biometrics .
The method is most commonly employed for the purpose of attendance of the people entering or leaving the respective place .
As each person have different voice , face , fingerprint , hence faking a biomerics is very difficult .
Hence , from the given information of the question ,
The correct answer is biometrics .
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Answer: The police officer
Explanation:
The police officer was the one who spotted the evidence and notified the investigator ,he is the key witness in the investigation. The investigator will present the evidence and the validity of the evidence will be questioned and the only witness to the validity of the evidence is the police officer.
