Someone should write a disk formatting utility that randomizes the bits on your drive.
Now you can claim that any encrypted drive (which just looks like pure noise if done correctly) is a drive that was just formatted.
That would just be dd if=/dev/urandom of=/dev/path/to/device
Be careful in countries like UK which have laws requiring the decryption of any data they find. There are people sitting in jail because they couldn't decrypt the "random noise" on their computers.