I think people have a much closer connection to electronic devices. We arbitrarily say that police can't force me to say something, so where do we draw the line

I think people have a much closer connection to electronic devices. We arbitrarily say that police can't force me to say something, so where do we draw the line? Can they fake my voice in a recording? Can they use a clone? As brain-computer interfaces become more feasible, this will be a less theoretical concern. There's an interesting overlap with encryption laws, also. If the authorities can force me to decrypt encrypted material, can they also force me to cryptographically sign material? What if unlocking my device implicitly signs my communications?