They call it the "magic question."
When jury selection opens Monday in the Bill Cosby trial, the judge will likely ask the men and women in the pool whether they can set aside anything they've heard about the case and render a verdict based only on the evidence.
The problem, according to one legal scholar, is that people are terrible at judging whether they can be impartial.
"Jurors almost always say yes," said Christopher Robertson, associate dean at Rogers College of Law at the University of Arizona. "It's an impossible question to ask. It's scientifically junk."
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