Recently, Lillian said, she has concentrated on shops in the same chain -- she visited 50 in one month -- and now has a routine for her visits.
Scanning the shelves and seating area as she enters, she moves quickly to the bathroom to check for cleanliness and supplies, then heads to the counter to order a coffee drink, which will never pass her lips. Instead, she whisks it away to a neighboring store, where she measures the temperature with a thermometer. She takes the portable scale from her handbag and weighs the drink to make sure that it was filled to the company's standard. Then she deposits the drink in a trash can.
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