Apparently, haggis was illegal. It was banned in 1989 by health officials fearing mad cow disease (which is not really called mad cow nor is it confined to cows). Haggis is a pudding made of (among other things) sheep offal and oatmeal. It is a prized component of Scottish cuisine and a particular favorite at commemorations of the poet, Robert Burns, especially Burns Night, which happens to be tonight.
Well, it is illegal no more. The World Organization for Animal Health decided that sheep lungs no longer pose a threat of scrapie, a close variant of mad cow disease. So, the USDA has decided to permit its importation. Sheep lungs for everyone, I guess.