Criminals Learn Forensic Science
Criminals are adapting to advances in forensic science:
There is an increasing trend for criminals to use plastic gloves during break-ins and condoms during rapes to avoid leaving their DNA at the scene. Dostie describes a murder case in which the assailant tried to wash away his DNA using shampoo. Police in Manchester in the UK say that car thieves there have started to dump cigarette butts from bins in stolen cars before they abandon them. “Suddenly the police have 20 potential people in the car,” says Rutty.
The article also talks about forensic-science television shows changing the expectations of jurors.
“Jurors who watch CSI believe that those scenarios, where forensic scientists are always right, are what really happens,” says Peter Bull, a forensic sedimentologist at the University of Oxford. It means that in court, juries are not impressed with evidence presented in cautious scientific terms.
Detective sergeant Paul Dostie, of Mammoth Lakes Police Department, California, found the same thing when he conducted a straw poll of forensic investigators and prosecutors. “They all agree that jurors expect more because of CSI shows,” he says. And the “CSI effect” goes beyond juries, says Jim Fraser, director of the Centre for Forensic Science at the University of Strathclyde, UK. “Oversimplification of interpretations on CSI has led to false expectations, especially about the speed of delivery of forensic evidence,” he says.