Documenting a crime scene is pretty crucial if you want to secure a conviction but you have to be quick, precise and get it back open to the public in time.
A police force in Roswell, New Mexico, have a new toy that could revolutionise all this - a 3D-scanner that can virtually reproduce the entire scene and keep it forever.
The Faro 3D scanner system allows the police force to "fly through" the area using a tablet with officers able to zoom in on points accurate to within a "couple of millimetres".
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The benefits of such a system are obvious but Inevitably there will be issues with ho reliable a virtual image is that is vulnerable to manipulation post-fact.