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Samsung may need several more years to replicate Apple's Face ID magic, but in the meantime, the Galaxy S9 should sport a beefed-up iris scanner.
Is the security of iris recognition technology on the Galaxy S8 an "issue"? Probably, although Samsung thinks a hack is difficult to happen in reality.
There's no such thing as an infallible, impenetrable biometric authentication system, at least not on the Samsung Galaxy S8.