When Matthew Stone sits in his wheelchair just before he gets shot, he receives text-messages in his phone with a countdown as 3,2,1. When later the phone is examined at the CSI-lab, and the messages are displayed on the big screen, the numbers have changed to Three, Two, One.
Matthew Stone places evidence in a hidden storage on a standard letter which he sends to Heidi Taylor. But there is a significant risk that such a letter will simply be disposed of.