I'm a fan of CSI shows. I watch all three (which is why it was a big deal that we didn't get CBS for a long chunk of time & partly why we switched to DirecTV). However, I have to laugh at how easy the crime scenes are in the three shows. I think maybe the New York one is the closest to reality with the messiness of people's homes. The Miami show has everyone living in minimalistic, spotless houses, with nary a speck of dust. The original show is somewhere in between.
In any case, on all three shows, they wind up finding little tiny bits of something that will provide DNA or some kind of something that allows the team to track and find the killers. But because the crime scenes are so TIDY, they can find the ONE HAIR or whatever it is and find the killer.
I just can't imagine a normal house being that much help to investigators. If you have a house with kids - good luck finding anything usable for evidence that's going to lead you to a killer.
Then what if you have someone with hair like mine? In the photo below - on the left are two strands - one is thicker & curly like a corkscrew, the other is fine & completely straight. On the right are two gray hairs - one curly, and one straight. So according to the CSIs on TV, those are 4 different suspects! Muahahahah!
While my hair is mostly straight, I do have these odd curly ones that are thicker. They have dark roots, so I can't say they are going gray, and the gray ones come in curly and straight as well. My hair has changed with age & childbearing. But some has stayed as it used to be, although it's gotten darker over time.
I know - weird.
Oh - look from the edge of the lamp to see all 4. The second in from the left looks like part of the desk leg, but it's the straight hair. As it is, taking a photo of strands of hair was an interesting endeavor. Lighting is key!