Dallas police pioneering new photo lineup approach (AP)

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AP - Frustrated with a string of wrongful convictions, the Dallas police department is now the nation's largest force to use sequential blind photo lineups — a widely praised technique designed to reduce mistakes made by witnesses trying to identify suspects.

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Dallas is not the first department to use the pioneering method. But experts hope that by using it in the county that leads the nation in exonerating wrongly convicted inmates, Dallas will inspire other departments to follow suit.

"If Dallas can do it ... then others are going to rise to the occasion," said Iowa State psychology professor Gary Wells, a national expert on police lineups.

The department switched to sequential blind lineups in April. Before that, Dallas police administered most lineups using the traditional six-pack — law-enforcement lingo for mounting six photos onto a folder and showing them to a witness or victim at the same time.