For at standse den, kan de faste kontroller ved de indre grænser dog spille en rolle, som det lige er blevet bevist ved opfangelsen af 106 kg heroin i Calais takket være en scanner, der pr. definition er fast, hos det franske toldvæsen.
And the fixed controls at internal borders have a part to play in stopping this trafficking, as the recent seizure of 106 kilograms of heroin at Calais, with the help of a French customs scanner - an instrument which is, by definition, fixed - has just made clear.