Biometrics as part of a security system that includes a human check, e.g. where someone puts their hand on a scanner in front of a human that can see the source of the scan is another human, makes for strong security. Biometrics in mobile devices does not. The phone has no idea if the 1 and 0s are coming from a human hand/finger/face or not, and its a password that will be hacked like all passwords can be, and these are ones you leave everywhere you go. Once it is you can never change it for the rest of your life.
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