Scientists are testing a novel technique to deter poachers targeting endangered rhinoceros for their prized horns. As part of a pilot study in South Africa, researchers have injected small, radioactive pellets into the horns of live rhinos. The goal is to make the horns radioactive so there is less demand for them on the black market. About 20 rhinoceroses have been selected for the pilot study dubbed the Rhisotope Project. Among the tests is examining the rhinos' blood to ensure the animals are not being harmed. Arrie van Deventer is the founder and managing director of Rhino Orphanage, and he oversees the research animals in South Africa's Waterberg Region. "We've all been looking and trying to find the silver bullet to stop rhino poaching, and I think this could just be what we need to stop poaching in its tracks. It is a brilliant idea," he said. Six months ago, the orphanage staff helped scientists insert radioactive pellets into the horns of wild rhinos. Recently, South African and American scientists returned to take more blood samples from the research animals and measure the gamma rays emitted by the pellets. According to Craig Marianno, a researcher from Texas A&M University, ensuring the animals are not harmed is the top priority.