CSI: Crime Scene Investigation is a tried and true part of the procedural genre, and like any good procedural there are plot points, actions, and structural elements that appear in every episode. The great shows that have come to define crime procedurals include CSI and Law & Order, and both shows were so successful that they spun off into sprawling franchises with multiple television shows within the same universe. However, no matter what version of CSI the audience is watching, there are constants across the board that make the show iconic and popular to this day.

https://screenrant.com/csi-tropes-every-episode-always-happen/