If you are ever expecting to be in a situation where a) you have incriminating evidence on you phone, and b) have reason to believe the police will likely try a

If you are ever expecting to be in a situation where a) you have incriminating evidence on you phone, and b) have reason to believe the police will likely try and get access to it at some unpredictable time in the future, I think you'd just be wise to not use biometrics at all.