Any school studying forensic science will probably be interested in this site.
Funded by the US National Science Foundation in conjunction with other organisations, CSI: The Experience Web Adventures provides three adventures, one each for beginner, intermediate and advanced. Registration is free and players can either sign up or play as a guest with no login (this means you won’t be able to save your game to resume playing at a later date). CSI characters help guide you through the adventure and offer help when needed.
This could be a good site for language learners as adventures are available in German and Spanish as well as English.
There are a number of resources for educators for students at different levels, a family guide, as well as links and other activities. Please check the site out before using with students as the nature of crimes involved may not be appropriate for everyone.
Thanks to Richard Byrne from Free Technology for Teachers for supplying the evidence!