This is the weird science episode. As the CSI's interrogate a suspect, he makes a run for it, gets tazed by an officer, and subsequently bursts into flames. The investigators look into this incident, which leads them to a string of people who all have green blood form a certain medication they are taking. Investigators also find a couple dead in their bed -- both with pace makers -- but they determine the cause of death has to do with squirrel poison.