<p>Aug. 18 issue — Like many teenage girls in Minneapolis, 17-year-old Stacey liked to hang out after school at the Mall of America, Minnesota’s vast shopping megaplex. Cute, blond and chatty, she flirted with boys and tried on the latest Gap fashions. One day last summer, Stacey, which isn’t her real name, says she was approached by a man who told her how pretty she was, and asked if he could buy her some clothes. “He was an older guy, dressed really well,” she recalls. “He said he just wanted to see me in the clothes.” Stacey agreed, and went home that night with a $250 outfit.</p>