
I have only recently started watching the TV series Bones, starring Emily Deschanel and David Boreanaz. Thanks to holiday marathons I think I've seen most of the episodes now, and they're quite enjoyable.
However, I do have to question some of the science.
For example, the episode I'm watching right now, "Mother and Child in the Bay", has the plot (based on the Lacy Peterson disappearance) that a women's skeleton is found in some water. She's been in the water for a year. Yet the "squints" are able to find DNA material under her fingernails.
But the body was not just dumped into the bay... it actually apparently came down a stream over the course of the year... to the bay.
So, first off... there would be no fingernails, so there could be no DNA.
Secondly, even if there were fingernails, there would be no way that DNA could remain under the fingernails for a month.... let alone a year.
I mean... we've all done it. Had dirty fingernails and gone swimming, and gee, at the end of an hour your fingernails would be perfectly clean! And after a year in water...
