Pretty much the whole appeal of the CSI shows — apart from watching David Caruso work a pair of sunglasses — was the forensic work. I don't know how much of it was based in fact but at least for TV, it worked well to examine the myriad ways people left signs of themselves behind, things that could be traced back to them through science.
Hey, it even worked well enough that the show reportedly boosted enrollment in forensic science programs in the early 2000s, where presumably students learned that "zoom and enhance" was...not a real thing.
Of course, it's not just people that leave things behind and that we get evidence of indirectly. That sort of stuff is around us all the time. You just have to watch out for it.