Workers examine remains at a mass grave in eastern Bosnia in 2004.
It's hard to convict someone of murder if their victim's body is never found. And it's hard to find a body once it's underground.
This is the problem troubling researchers from the National University of Colombia in Bogota. The group of forensic geophysicists is developing techniques that may help officials locate clandestine graves, including mass graves where the victims of war crimes are often buried.
The researchers plan to simulate clandestine mass graves by burying pig carcasses in eight different soils and climates throughout Colombia. They will then study the graves using technological methods like ground penetrating radar, electrical resistivity, conductivity and magnetometry.
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