1) When properly used, commonly freely available encryption should be unbreakable even when given completely unreasonable resources (i.e., a Manhattan Project scale effort). Alternative methods (e.g. kidnapping&torture of everyone who might have access to keys and their relatives) would be far simpler and cheaper than actually bruteforcing proper cryptography.
2) There are freely available steganography/hidden volume tools that make it impossible to verify IF there is something encrypted - for example, you might guess that a hidden volume exists, the accused may decrypt N hidden volumes, but noone would be able to check if there is another N+1'st volume for which a key was not provided.