9-1-1: Lone Star's depiction of mercury poisoning is intensely mocked by a real doctor. The storyline in question comes from the episode "Yee Haw", which goes all the way back to the second episode of the 9-1-1 spinoff. In it, the show's core group rushes to figure out a bizarre outbreak of mercury poisoning that leaves people behaving in extremely odd ways. The installment, written by series co-creators Ryan Murphy, Brad Falchuk, and Tim Minear, features more typical family and personal drama, but it's remembered for the outlandish case of the week.
https://screenrant.com/911-lone-star-mercury-poisoning-doctor-reaction/