If you tried to use that as a defense, you would likely have the court grant you immunity from using the contents of your passphrase as evidence of having commi

If you tried to use that as a defense, you would likely have the court grant you immunity from using the contents of your passphrase as evidence of having committed a crime and that it would only be treated as a random string. However, that then puts you in the awkward situation where you're admitting that the passphrase is an actual criminal admission and you might end up being "randomly" selected for an investigation along those lines to find evidence to independently corroborate the criminal act.