Some do. You can also just restart a phone real quick and it'll demand your passcode not biometrics.
The passcode itself isn't circumvented by this, after all.
But locking/resetting your phone should be an urgent thing, if you suspect the police will take it. Apple also does this if you hit the power button 5 times fast.
Samsung phones have a lockdown mode you can get to when you keep the power button pressed (like when you want to shut down).
The legal situation is the same here in Germany - fingerprint unlock can be forced, regular pin or other measures not.