Not sure how asking a question warrants a down vote but - OK.
My actual question remains unanswered - regardless of method used or whether it's viable or not - is it legal for them to bypass your security and view information when you refuse to hand over the password?
Seems so for GCHQ with a warrant
http://www.wired.co.uk/article/gchq-hacking-legal
Probably not for your typical customs official tho.
Biting the hand that feeds IT
