I don't cross international borders much (I'm an American after all), but give the increasing frequency of this kind of thing I wonder what the response by a police state would be to the following:
I encrypt my drive and place the key on an SD card (or something similar). I securely transmit a copy of the key to my lawyer. Before entering customs, I remove and destroy the SD card (perhaps handing the broken pieces to the stewardess in a hand-full of garbage if I am concerned about my ability to truly destroy the data.)
When asked by the government thugs fro my key I explain that the only copy still in existence is with my lawyer and I will need to contact him/her in order to decrypt the drive.
Assuming I make it through costumes without incident, my lawyer can send the key to me.