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This is ALL THINGS CONSIDERED from NPR News. I'm Michele Norris.

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And I'm Melissa Block.

We've seen the Hollywood version of police lineups in movies or on TV. Of course, they don't normally happen that way in reality. And for years, the way actual police departments conduct their lineups has been scrutinized by psychologists. The scientists worry that innocent people were landing in jail.

NPR's Alix Spiegel has this story about how after years of research, the science of the lineup is making its way out of the lab and into a police station near you.

ALIX SPIEGEL: Last year, in a small room at police headquarters in Dallas, Texas, an officer and an eyewitness to a minor crime sat down together to consider six photographs. The photographs were all of people who looked roughly similar. One was the actual suspect; the other five, people known by police to be innocent. The officer presented these pictures carefully, one photo at a time.

Unidentified Man #1: Is this the person you saw writing graffiti on your neighbor's fence Saturday?

Unidentified Man #2: No, but it's a maybe. I'll maybe come back to that one.

Unidentified Man #1: Okay.

Unidentified Man #2: But I'm saying for now, I'm saying no.

SPIEGEL: Eyewitness identifications like this happen every day. And on the surface, it is a straightforward transaction. The witness looks, considers, picks a person from the photos or doesn't.

Unidentified Man #1: Is this the person?

Unidentified Man #2: No.

SPIEGEL: But, in fact, the officer and the witness are engaged in an incredibly subtle emotional dance, moving together and apart in ways that neither are fully aware of. Listen carefully.

Unidentified Man #1: Is this the person?

Unidentified Man #2: I mean, that's a maybe.

Unidentified Man #1: Maybe? A not sure or a yes...

Unidentified Man #2: It's a maybe.

Unidentified Man #1: ...or a not sure?

SPIEGEL: Notice the officers repeat his question, which causes the witness to think again.

Unidentified Man #2: Yes, I'm not sure.

SPIEGEL: Maybe the officer slightly shifts his posture, relaxing a bit as if he's not so interested, which can cue the witness that the man in this picture is not the person the police are really interested in.

Unidentified Man #2: I guess I'm not sure is a maybe.

Unidentified Man #1: Okay.

SPIEGEL: Small changes like this - in posture, in speech - can change what a witness sees in a photograph, transform someone who is just another face into a criminal suspect and vice versa.

Professor GARY WELLS (Psychology, Iowa State University): We look for cues in our environment to decide what's an appropriate answer, what's an appropriate response. That's human nature.

SPIEGEL: Gary Wells is a psychologist at Iowa State University who studies police lineups. By staging crimes and analyzing the way that witnesses pick out suspects, he's uncovered all kinds of things about lineups that were previously hidden - research that has led Wells and other researchers to suggest a series of reforms.

Prof. WELLS: So let me give you an example...

SPIEGEL: For example, one reform Wells suggests is that the officer conducting the lineup should not know which person in the lineup is the actual suspect. Otherwise, Wells says, that officer will unconsciously communicate to the witness who the suspect is.

Prof. WELLS: It's just not really possible for people who know an answer to perform these kinds of tasks in a totally neutral way.

SPIEGEL: Wells also says that witnesses should be told before viewing the lineup that the actual criminal might not be present. Just that little sentence will apparently change the rate at which people are picked from lineups.

Also, he says, instead of showing the pictures all at once - which encourages the witness to compare the people in the lineup to each other - photos should be shown one at a time because doing it that way encourages people to compare the person they're looking at with the person that they have in their heads, and that seems to result in fewer innocent people getting fingered.

Prof. WELLS: That tends to reduce false picks.

SPIEGEL: So those are the major reforms researchers like Wells have suggested. And about nine years ago, police departments actually started to change.

Lieutenant DAVID PUGHES (Dallas Police Department): It was probably the biggest change that our investigative bureau had seen since the Miranda warning.

SPIEGEL: This is Lieutenant David Pughes of the Dallas Police Department. Dallas officially adopted lineup reforms two years ago. And Pughes says, like most places, at first the officers in Dallas resisted the idea.

Lt. PUGHES: We had a lot of skeptics that believed that the way that they were doing was fine. You know, that there was no way that they were influencing anybody during these eyewitness identification procedures. And frankly, a lot of the detectives felt like the change of the procedure was almost a question of their integrity.

SPIEGEL: Today, about 25 percent of police departments nationwide have reformed their photo lineups. So how are the reforms working? Gary Wells...

Prof. WELLS: We don't know the answer to that. Well, there have not been good studies of before versus after these reforms.

SPIEGEL: In fact, in the last 10 years there's been only one study of how the reforms affect witness selection on the ground. And that study has been widely criticized by researchers. But Pughes feels confident that fewer innocent people are being picked out of photo lineups. In fact, he says that the reforms have radically changed the whole way the Dallas police think about eyewitness testimony.

Lt. PUGHES: We are very much more critical about conducting a photo lineup. We don't just say, okay, they pointed to this picture and says this is the person that did it so we're going to put them in jail.

SPIEGEL: Pughes says for most of his career that was how it was done. But his confidence in the old ways has evaporated. Eyewitness testimony, Pughes says, is just not what it appeared to be.

Alix Spiegel, NPR news, Washington.

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