The CIA and full weight of the US government will bear down on anyone attempting to buy a few grams of saffron.
More so that when you try and import it, it will be pulled by customs and held and you won't receive your saffron and it will be a pain for escrow and all involved but whatever.
Do you have any experience?
I guess that is true just for bulk orders and USA.
Rest of the world wouldn't have any problem with that.