If multiple users had enrolled the same fingerprints or faces, then there can be some security problems.
To prevent users from enrolling duplicated fingerprints or faces, duplication check in BioStar 2 is supported from BioStar 2 v2.7.8.
You must match BioStar 2 server version and device firmware versions to enable 'Duplicate Check' feature.
<Fingerprint Duplicate Check from BioStation 2>
<Face Duplicate Check from FaceStation 2>