Next, we might have RFID chips embedded in shopping carts, shelves and her loyalty card that would identify the path she took through the store, what items she inspected but did not buy and so forth.

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Hatfield said the oil return line is one of the items that is routinely inspected, but she did not say when it was last inspected or describe its condition at that time.

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Suspicious items are screened with X rays--or ripped open and inspected.

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Immediately after each service, the cars were checked to see whether the faults had been spotted, and inspected to see exactly which parts of the car had been checked and which items had been fixed or replaced.

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