RE: IdylBrook Farms of Rochester
It seems like it depends what state you are in, whether it's illegal.
I just thought it was an unpopular meat in the USA, kind of like lamb doesn't sell well outside of ethnic areas, or veal, which some find offensive somehow.
Horsemeat had some brief trendiness in the early Seventies, when you could find it in supermarkets. There even was an "All in the Family" episode, with Archie and Meathead debating its merits, if I remember right.