A juror once complained to a judge that police had failed to dust the lawn for fingerprints. That story opens this episode on the CSI effect, the claim that the show CSI: Crime Scene Investigation, which premiered in 2000, rewired what the public expects from forensic science. On screen, lab technicians raid houses and interrogate suspects, plaster poured into a stab wound reveals the exact knife, and DNA results arrive before the commercial break. Real testing takes weeks or months, and real analysts avoid the word match.

Lawyers panicked in two directions: that jurors would acquit without flashy forensic proof, or convict on science they overvalued. Prosecutors began screening jurors by their viewing habits and hiring experts to explain why evidence did not exist. Then the data came in. A Michigan study of more than a thousand potential jurors found higher expectations but no link between watching crime shows and acquitting. The episode also follows the effect into universities, backlogged crime labs, and the habits of criminals.

• By 2005, six of the ten most popular shows in the United States were crime dramas, and one forensic scientist estimated that 40 percent of the techniques shown on CSI do not exist.
• After Robert Blake was acquitted of murder, the Los Angeles district attorney blamed the CSI effect and called the jurors incredibly stupid.
• A 2009 study of trial statistics in eight states found that the acquittal rate had gone down, not up, since the show began.
• Forensic programs at Florida International University and UC Davis doubled in size by 2004, while lab directors complained that graduates lacked basic science.
• A woman attacked by serial rapist Jonathan Haynes, inspired by the show, pulled out her own hair and hid it in his vehicle, which tied him to the crimes.