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CSI has been called in to figure out what happened to a man who died on the street. However, when they take his body to the lab, Alexx discovers that the man’s skin is deteriorating, due to radiation poisoning. Now, the team must try to solve the case before the next victim, a lawyer working on an environmental case, suffers the same fate.
Belle King: Did you know Horatio was the first CSI?
Horatio: He was ... the what?
Belle King: In Hamlet. When Hamlet was poisoned and dying, he asked his best friend Horatio to tell the world who murdered him.
131 (or any radioactive material) at the end of its half life does not instantly become non-radioactive, as was depicted in this episode. Radioactive decay is a continuous process. The half-life has no beginning, but tells you how much time after now for however much is there at any time now to be reduced to one half that amount. Wait enough half-lives and the amount will fall to an inconsequential amount, but one is never enough.