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This states that an item shall be exempt from the normal sales controls if it was acquired prior to June 1947 and has been "significantly altered from its natural raw state for jewellery, adornment, art, utility or musical instrument." It is illegal to sell or offer for sale any rhino horn 'worked' after the 1947 deadline or 'unworked' rhino horn of any age.

But what did or did not constitute a 'worked' item with relation to animal horns and tusks was open to some interpretation. While a rhino horn libation cup was clearly altered from its natural raw state, and a rhino head considered taxidermy, where did the law stand on the horn mounted alone on an oak shield?

Two years ago, under pressure to fall in line with Europe, Animal Health clarified these legal definitions and now deem the rhino horn trophy (previously considered to be part of an endangered species in its raw state) to be a work of art. Perhaps unwittingly, it is this change that had the effect of opening the floodgates to dozen of vendors who owned rhino horn trophies but had previously been unable to sell them on the legitimate market.