Researchers in South Africa are working on a potentially new method to deter rhino poachers and smugglers by using radioactive markers to make smuggled horns detectable at global ports of entry and less desirable to buyers. South Africa is home to the world's largest rhino population but has battled poaching for decades. The rhino horn is one of the most expensive commodities in the world by weight, fetching tens of thousands of dollars per kilogram.
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