Yes very good points. Although I would guess that the number of barrels out of a whole shipment that are tested to see if it is what is says it is very small.

Yes very good points. Although I would guess that the number of barrels out of a whole shipment that are tested to see if it is what is says it is very small. E.g importing 50 barrels of a specialist but non suspicious acid and one happens to be aqua regia with $2m dollars of gold dissolved in it sounds fairly good odds to me