Two years ago, she investigated a cheating ring on the SAT that led to tougher identification requirements for test takers.

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Buying a diamond ring soon after buying petrol results in an even higher risk score: thieves often test a card's validity with a small purchase before buying something much bigger.

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Amla duly went to his third Test century - all scored against New Zealand - before being caught in the cover ring on 103.

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In the outer ring, it can involve a complicated analysis using the multi-modal, non-exclusive test originating with the Department of Justice, and later adopted by the Courts.

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