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Stop Using Your Face or Thumb to Unlock Your Phone
(gizmodo.com)
This is a most excellent place for technology news and articles.
FYI Androids have a feature for this. If you are ever forced to interact with a cop you can press the side button and volume up(might be different on other phones) to select lockdown which will force your phone to only be opened with the password. Its gross that we need this feature, but now you know.
It's good that they have this, but there are a lot of situations involving cops where it's not going to be safe to stick your hand in your pocket. I'll just leave the biometrics off on my devices.