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.