My girlfriend is a forensic DNA analyst, and she testifies in court all the time -- you're absolutely right, they're looking for people who watch and believe CSI, because the "CSI effect" is growing more and more common with juries nationwide. People expect the prosecution to be able to turn up DNA evidence for everything, of a type and style which just isn't possible in the Real World. It's been pretty widely discussed (http://www.google.com/search?q=%22CSI+effect%22), and it's becoming a serious problem in criminal justice. (The Girl gets subpoenaed regularly to testify, for instance, that no DNA samples were found...)

(The CSI effect is also making people smarter about how they commit crime, too.)