In episodes of “Mad Men,” it’s not uncommon to find Don Draper and his colleagues huddling in the office and drinking alcohol. Boozing and schmoozing on the job was once a staple of white collar America and offering a drink to visiting clients was a part of doing business. While the days of having a bar in the office or bottle in the file drawer may no longer be acceptable in the modern office, drinking with work colleagues, clients and customers continues as a primary form of socializing. Alcohol is also the most used and abused substance in America. And high-functioning alcoholics, a phrase many fans attributed to Don Draper as his life spiraled out of control, continue to be part of the American workplace. The most recent report from National Survey on Drug Use and Health reported that 8.7% of full-time workers aged 18 to 64 used alcohol heavily and that 9.5% were dependent on or abused alcohol or illicit drugs in the past year. A functional alcoholic can still operate in the work world, and may hide his or her drinking problem or live in denial of their disease, but there are certain telltale behaviors that co-workers may...