I'll just say with respect to the 0.05 issue, in the study “Relative Risk of Fatal Crash Involvement by BAC, Age and Gender”, done by the United States Department of Transportation, they actually divided males and females by three age groups. If you are a male at 0.050 to 0.079 the relative risk, if you are 16 to 20, of being involved in a fatal crash they calculated to be 17.32 times what it would be if you were a sober 16- to 20-year-old. By the time you are 35, it is down to 5.71. For females 16 to 20, it is 7.04. By the time they're 35, it is 5.79, in that range. They calculated that on the basis of masses of detail.
We aren't social scientists, but we can look at these things. There is, I believe, some fairly strong evidence of seriously higher risk of accident at 0.05 to 0.08.