Their investigation reveals a sinister plan in motion, targeting people through poisoned water.
There are already two victims, as revealed by the video below.
The speed of death after being poisoned varies depending on the potency of the poison.
Image via Mark Schäfer/CBS
If he succeeds, the water could kill thousands of people.
A race against time begins to stop him before he succeeds.
The show ends in two months, witha series finale date already set.
The final hunt involves an attempt to stop a terror attack.
“Toxic Behavior” was written byElizabeth Rinehartand directed byCraig Langus.
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