drinking and driving

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i hate it everytime a buddy of mine comes to my place and then after few 5-6 beers, he is a bit high but insist that he is fine to drive the 20 mins back to his house. he has been doing so for years (driving after few beers)and hasn't encountered any problem. but what i hate most is some times he brings his 2 kids along to my place in the daytime on weekends where they can go for a swim at the apartment's pool with my kid but come time to go home with their dad, it will usually be in the evening after dinner in which,he will have had a few beers at my place which he will usually bring . although , he seems not out of control , still clearheaded,not overly drunk, still it worries me each time he drives off knowing that it is impossible to say anything about it. very sensitive after few drinks. I brought it up once and his ego just lashed at me. Now when he brings his kids , i usually ask them to stay a night saying i will send them back following day and they can swim an extra day, but as for the dad?? Is there such a thing as moderate drinking and driving? i will never drive after 4 5 beer cans,my wife will, or if she feels like having a few drinks off normal,then i stick with maybe a beer or just one drink whatever it is,and i drive? we have an arrangement.