That's a nice feature, every OS should have that.

I believe the old TrueCrypt had two passwords, each revealing a different set of files. You'd put e.g. your tax forms in one, so if forced to decrypt your drive, you could cooperate and do so.

It's not illegal to delete your own vacation photos. So to prove this guy guilty of destruction of evidence, does the government need to prove there was actual evidence in the phone?