Dont use biometrics to unlock phones/computers.
They cant compel a password from you. They can compel a fingerprint. Bipolar courts have ruled this is ok.
There are full-disk encryption systems for Linux that allow you to create multiple encrypted partitions in the same space, with different passwords.
Supply your other password and they see your other partition.
I’ve not seen this on a phone, yet.
And even if it did exist, there aren’t many people who have secret documents of the sort that this would protect. It’s the automatic records of the thousands of ordinary transactions that the investigators want.
Good point