Maybe in this case, it is somehow clear that there is encrypted stuff and the government is also sure who can decrypt it (who owns the key to decrypt it.) But since a variety of Deniable encryption[0] exits, what happens when they think there is something to decrypt when there isn't? Or when they can't prove it but they want to believe there is something there?

[0] https://en.wikipedia.org/wiki/Deniable_encryption