“Far too often, investigators who have worked a case for a while will become entrenched in their own theories. As a result, they’ll literally funnel every new piece of evidence through their account of the crime. And if a piece of evidence seems to call that theory into question, they’ll downplay or even disregard it.” It’s a phenomenon known as confirmation bias—as humans, we are predisposed to favor any information or opinion that affirms our preconceptions.
