Biometrics are effective at preventing snooping of your password. Before biometrics, I would eventually know everyone in my home's pin unless I made a consciou

Biometrics are effective at preventing snooping of your password. Before biometrics, I would eventually know everyone in my home's pin unless I made a conscious effort to always look away each time they unlocked their phone. I'd be cautious to use anything but biometrics on a crowded train.