I'm not American but I think it is o.k. . If the police tests people randomly and you know you can be picked regardless of how you are driving you will think twice about drinking/drug consuming and driving. It is also a signal that the police is there and is watching. If one never gets checked by them one might just as well start to believe that they don't care at all for the traffic and do something stupid then. Better feel their presence and drive safely than making people believe they aren't watching at all.
In Germany they are checking especially young people at Friday and Saturday nights. I 've been checked three times in about 10 years. Here they are asking you whether you have consumed alcohol. If you answer no and you seem to be sober they just have a look at you drivers license and registration and are off again. How ever if they smell alcohol you get tested (happened to me once because I had cleaned my wind shield just before they pulled me over and the washing water contained some alcohol to keep it from freezing and that was what they smelled).
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Putting Germ back into Germany. 
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