<blockquote>The system was then tested during 2013, and the results - showing whether suspects did in fact offend or not - were monitored over the following two years.

Forecasts that a suspect was low risk turned out to be accurate 98% of the time, while forecasts that they were high risk were accurate 88% of the time.</blockquote>
via <a href="http://www.bbc.com/news/technology-39857645">Durham Police AI to help with custody decisions - BBC News</a>.