I don't think many would complain if there was a truly secure way to allow decryption of a single person's communication after the fact. The problem is partly

I don't think many would complain if there was a truly secure way to allow decryption of a single person's communication after the fact. The problem is partly that end users have no way of knowing when their communication has been decrypted. I know if the cops kicked my door in, I don't know if they're watching my messages with or without a warrant.