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ROBERT SIEGEL, HOST:

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ROBERT SIEGEL, HOST:

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The Justice Department says it is investigating "possible unlawful coordination" by several major airline carriers. American, Delta, Southwest and United Airlines have all confirmed receiving letters from the Justice Department.

In a statement, American said the department "seeks documents and information from the last two years that are related to statements and decisions about airline capacity."

A United spokesman said the company is complying fully in regard to the probe.

Crime in America may be on the rise again. It's too early to talk about a national trend, but there have been troubling spikes in shootings and murders in big cities such as New York, Baltimore and Los Angeles.

Until recently, crime decreased steadily for two decades, and the national murder rate is half what it was in the early 1990s — so police departments are under pressure to crack down. But at the same time, their tactics are under more scrutiny from the public, and they have to be careful not to appear too heavy-handed.

If you run into an old friend at the train station, your brain will probably form a memory of the experience. And that memory will forever link the person you saw with the place where you saw him.

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