Their reports on school violence advise instituting techniques of early detection and threat assessment as the means most likely to succeed in stopping school killings.

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But the growth of those in-game economies, combined with new protections on bank accounts like fraud detection and authentication systems, means games have become the path of least resistance, says Gary McGraw, a security consultant with Dulles, Va.

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Boston Logan launched a pilot expansion of the behavior detection program last year, adding casual conversation with passengers as a means to detect behaviors that may indicate security threats.

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