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Suspects can refuse to provide phone passcodes to police, court rules
(arstechnica.com)
This is a most excellent place for technology news and articles.
This is a complicated situation, but in my opinion, probably the correct decision.
Given this is the ruling, if you do believe your phone is about to be confiscated, and you don't want its contents to be used as evidence, it might be a good idea to turn off your phone. Although the police cannot compel a password, a biometric unlock is not a password. If you turn off your phone, it will generally require a password to enable biometric unlock.
You don't even have to turn it off. This is why lockdown mode exists.
Not all phones have it I believe. For example, OnePlus just removed one day with an update when they switched to using a ColorOS skin.