ACS Biometric: De-Duplication

I could not find much on the google for ACS Biometric; would like to know from the community; what are the best practices & solutions for De-Duplication


Hello Srikanth:

What do you mean by 'biometric'? Fingerprint? Vascular? Iris?

Also, clarify 'de-duplication': Do you mean 'copy prevention' or 'anti-spoofing'?

Thanks!