Rhino horns are injected with radioactive isotopes. The method is harmless and allows detection by border officials.

South African scientists have launched an anti-poaching campaign in which rhinos' horns will be injected with a radioactive material. The group, from the University of the Witwatersrand, said the process is harmless to rhinos but will allow customs officers to detect smuggled horns as they're transported across the world.

Scientists working on the cleverly named Rhisotope Project have begun work embedding radioactive isotopes in the horns of wild rhinos in South Africa. Far from making the rhinos g