"In the Cardassian legal trials are entirely a formality and only have a ceremonial function. The verdict is determined long before the actual trial is held. The person prosecuted learns what he or she allegedly committed at the trial."
Which is a generalisation based on a single episode. Is it universally true? Do we care?
It could be written better ("In Episode X a Cardissian legal trial is shown to be entirely a formality..."), but the episode is a valid source. I don't care if you care or not - how much people care doesn't appear anywhere in Wikipedia policy that I know of.