Michael Guirdy Allen was one of more than 400,000 people who fled the New Orleans area after Hurricane Katrina crippled the city's levees and flooded its streets. The 40-year-old man from Harvey, a suburb of New Orleans, still hasn't returned. But Allen left behind a string of warrants for charges as far back as 2000, including attempted murder, false imprisonment, three counts of child molestation and aggravated assault. Allen is one of more than 2,000 fugitives and sex offenders whom local, state and federal authorities are trying to locate and, in cases such as Allen's, arrest. Two months after Katrina...