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Is the smog exam really a road safety check other than if it's so obviously unsafe that they won't drive it to the smog machine? Especially since post-2000 cars are just an ODB-II check, a visual check for exhaust modifications, and a check for smoke at various engine conditions. The procedural manual does mention visual inspection for gasoline fuel leaks (diesel and gaseous fuel leaks are fine, apparently). I'd imagine techs were a little more worried about vehicle safety when they were putting the cars on dynos, too.