wonderful thing about encrypted information, with the right key it can be decrypted to say whatever you want. So if government has decided that you have plans for the al Qaeda attack on your laptop... well, you do.

Now all that you have to do is prove that you either don't know or have forgotten the key that decrypts your random bits into a plan they will accept. How hard do you think it will be to convince an aggressive prosecutor/judge that you are innocent when you have no evidence (can't prove a negative) and the government has reasonable suspicion?