Originally Posted by
Siberian_Viktorya
however, the police cannot force someone to reveal an actual password with letters/numbers/symbols.
Yes, they can (usually), so long as the ownership of the device isn't in question. If the ownership is in question, then requiring somebody to provide the password is essentially requiring them to admit that it's their device (and hence making them responsible for the content on it), which violates 5th Amendment protections against self-incrimination.