By Gina Kolata
South African authorities long had eyes on Rogers Mukwena. They knew the former schoolteacher was wanted in Zimbabwe for poaching rhinoceroses and selling their horns, which can command hundreds of thousands of dollars.
He’d jumped bail and fled to northern Pretoria, but it was vexingly difficult to catch and prosecute him — until a scientist helped make the case against him with rhino DNA.
His subsequent conviction resulted from a new tactic in wildlife preservation: The genetic fingerprinting methods that have been so successful in the criminal justice system are now being used to solve poaching crimes.
First, researchers in South Africa had to build a large database of genetic samples drawn from African rhinoceroses. The DNA would be used to match a carcass to a particular horn discovered on a suspected poacher or trafficker, or to rhinoceros blood on his clothes, knives or axes.
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