U.S. District Judge Virginia M. Kendall asked if anyone in the audience could estimate how many human trafficking prosecutions there are a year.“Just take a guess,” she said.The International Labour Organization estimates 21 million people are forced into human labor or sex trafficking yearly.One man in the audience guessed maybe a few hundred of those would be prosecuted each year. Another person guessed even higher and Kendall said that’s how many there should be.“Nine thousand,” Kendall …