Christie,
The co-op that my older girls took part in last year used the first book with the jr/ sr. high kids, and it was a smashing success. The mom who lead the class brought in a policeman that she knew from church, set up a crime scene in a room where the kids rarely entered (so they wouldn’t be familiar with the room itself and to keep the scene undisturbed), and several other fun projects that reinforced/ further explained the lessons in the books.
Bottom line, FUN science.
~j