Nelspruit police will present a short course on crime scene management for local security companies.
The course will include training for security guards on the correct handling of crime scenes.
Superintendent Gerrie Agenburg said security guards often arrived at the scene before the police.
"As the discovery of physical evidence at crime scenes plays a crucial role in securing the conviction of perpetrators in a court of law, it is important that they manage the scene correctly until the police arrive.
"The ability to providescientific interpretation is greatly dependant on how the scene was treated and it is important to manage it correctly," Agenburg said.
He said the scene should be cordoned off to protect evidence that should not be touched or moved. If evidence is moved, a note should be made of the exact location where it was found.