James Harvey Young, the foremost expert on the history of medical frauds, finds quackery in the 1990s to be more extensive and insidious than in earlier and allegedly more naive eras. The modern quack isn't an outrageous-looking hawker of magic remedies operating from the back of a carnival wagon, but he knows how to use antiregulatory sentiment and ingenious promotional approaches to succeed in a "trade" that is both bizarre and deceitful. In...