The PAX G 23 Paxilon Hydrochlorate (Firefly)

G-23 Paxilon Hydrochlorate or "Pax" (Latin for "Peace") was a chemical compound added to the air processors in order to pacify the populace, by the Union of Allied Planets.
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[@aliencat11]

I wouldn't be surprised if someone comes up with something like this one day.

[@OmegaSerenity]

Yup for sure