Not bad.
You have the characters and the general premise of the show down. I'm glad to see that. (And nice to know Greg is in character, too. :D)
The game was too short, though. I understand it's your first of this kind, so that's fine. Try to make it a little more complex if you do another one like this. However, the case is like one you'd see on the show, which is good.
One thing that confused me was the lack of a "back" button when you took a look at evidence. It took me a minute to figure out the green arrow. You may want to fix that.
Despite all that, though, I enjoyed it. I sent the link to a CSI LiveJournal community, and I think they'll like it. :D