Surveillance cameras, metal detectors, and secure telephone lines are among the beefed-up security measures to greet students across the country for the start of this year's classes.

This will be the first school year after the spring in which two Littleton, Colo., teen-agers killed themselves and 13 others in the worst school shooting in recent U.S. history. And in the aftermath, districts are spending hundreds of thousands of dollars on security consultants and technologies.

"As much as we'd like to believe schools are going to operate like they did in the 1950s and '60s, they can't," Barbara Erwin, superintendent of the Allen,


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