Factual error: The inspector is suffering from thallium poisoning. However, everyone is using various radiation detection methods to detect the thallium. Natural thallium is not radioactive. Of the artificial thallium, the only with a half-life long enough to last long enough to pose a problem is too weakly radioactive to be a significant hazard.
Other mistake: When Ziva signs the will, she signs it with her real name - "Cote" is visible.
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Suggested correction: No. We see in the closeup Ziva David writing her name, and the shot cuts away just as she starts to write the last "d" in David (timecode 00:28:00).
