Star Trek: The Undiscovered Country, released in theatres in 1991, marked the last of the Star Trek movies based solely on the original cast. In the plot of the movie, a historic Klingon peace initiative is nearly thwarted when Klingon chancellor Gorkon is assassinated, and Kirk and McCoy are accused of his murder.
... has existed all throughout human history, and probably pre-dates the emergence of effective medicine.
Quackery is still abundant today, herbal medicine[?], miracl ...