https://arstechnica.com/tech-policy/2019/11/police-cant-force-child-porn-suspect-to-reveal-his-password-court-rules/

The Fifth Amendment to the US Constitution bars people from being forced to turn over personal passwords to police, the Pennsylvania Supreme Court ruled this week.

In a 4-3 ruling, justices from Pennsylvania’s highest court overturned a lower-court order that required the suspect in a child-pornography case to turn over a 64-character password to his computer. The lower-court ruling had held that the compelled disclosure didn’t violate the defendant’s Fifth Amendment rights because of statements he made to police during questioning.