You always have to use all the colors. Then you choose three evidence clues and one testimony clue.
For the Major Case File there´s also a sketch made by The Nifty Pixel which you also get as a digital template which is great if you like to scrap digital. The great thing about CSI is that you can choose if you wanna do it in paper or digital.
Here´s how I solved this case:
I chose to rotate the sketch 90 degrees. I used a digital kit called Artistic by Meagan´s Creations which you can find at The DigiChick.
Have it great! /Carina