Defence lawyers have questioned the computer-based method used by a US DNA expert in the investigation into the murder of two soldiers in March 2009.

BBC: Patrick Azimkar (left) and Mark Quinsey

On Thursday, defence lawyers questioned Dr Perlin's computer based statistical analysis.

BBC: Patrick Azimkar (left) and Mark Quinsey

However, because of a late admission by the defence that Dr White would be using a new computer simulation to illustrate his theory, Judge Michael Pastor has given prosecutors the weekend to analyse the data before cross-examining the defence's expert.

BBC: Conrad Murray trial: Jackson 'addicted to Demerol'

Another example of the closing gap between the worlds of gaming and grown-up simulation is the decision in May by Digital Sandbox, a supplier of simulation software to America's defence department, to set up a consumer division to make computer games.

ECONOMIST: Serious games