Carol, sadly the Center for Disease Control also agrees with that webpage.
Research Update: Effectiveness of Designated Driver Promotion Programs to Reduce Alcohol-Impaired riving is Unknown- NCIPC
What are Designated Drivers?
The varying definition of a “designated driver” is among the challenges facing researchers who study the effectiveness of designated driver programs. The most common definition requires that the designated driver abstain from alcohol, be assigned before anyone in the group starts drinking, and drive group members to their homes at the end of the event or gathering. Another definition is based on the concept of risk- or harm-reduction. Under this definition, the designated driver needs only to maintain a blood alcohol content (BAC) limit that is under the legal limit. In practice, many people may apply the designated driver concept in ways that are unsafe (e.g., by choosing the person in the group who is least drunk to be the designated driver).
The study on the Malt beer drinkers is also interesting:
Characteristics of malt liquor beer drinkers in a ...[Alcohol Clin Exp Res. 2005] - PubMed Result
BACKGROUND: The authors describe and compare drinking patterns among malt liquor beer (MLB), regular beer (RB), and hard liquor (HL) drinkers in a low-income, racial/ethnic minority community.....The odds of preferring HL as compared with MLB were significantly increased for persons with white-collar occupations and those who drank in public settings and were reduced for persons who drank outdoors and those who combined drinking and smoking.CONCLUSION: The authors observed substantial differences in sociodemographic characteristics, drinking patterns, and ethanol consumption by beverage type in this community sample. MLB drinkers seem to have distinctive drinking patterns that require additional study to determine whether this pattern is associated with increased individual or community risk.