More than 30% of Americans engage in risky drinking at some point in their lives... ...Researchers have made up dozens of screening tests over the years. According to one developed for Johns Hopkins University Hospital years ago that still pops up on the Web, I'm "definitely an alcoholic" because I answered yes to at least three of 20 questions... But Alcoholscreening.org3 says I'm "below the range usually associated with harmful drinking or alcoholism" since I have only a glass or two of wine when I drink. The authoritative American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, or DSM-IV,...