In a sign of increasing concern about cheating, the nation’s top business schools will soon require a high-tech identity check for standardized admissions tests, the Wall Street Journal reports. Aspiring corporate executives taking the Graduate Management Admission Test, or GMAT, will have to undergo a "palm vein" scan, which takes an infrared picture of the blood coursing through their hands. The image–which resembles a highway interchange in a major city–is unique to every individual. The scans are used widely in Japan among users of automated teller machines but only recently have appeared in the United States. Palm-vein scanning on GMAT test takers will begin next month in Korea and India, with U.S. centers starting as early as this fall. The technology targets "proxy" test taking, a fraud in which applicants hire high-scoring imposters to take the exam in their place. Five years ago, federal authorities broke up a ring of six fraudsters who took more than 590 exams, including GMATs, for customers who paid at least $3,000…

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