Well, travelling abroad you rolls the dice and takes your chances. If'n someone wants to make an example out of you to boost their own ego or image, then it is going to happen and you are going to pay the price. Even if you are clean initially, they can plant something and you will be busted. You really are at the mercy of those who owe you nothing.
_________________________
The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)