That's hard to test because you might kill people or go to jail in the process, not because it's simply hard to test.
Also, concluding through controlled study that alcohol consumption impairs your ability to safely control an automobile is much easier than concluding that caffeine intake impairs creativity.
Creativity for one thing can be highly influenced by inspiration. Driving ability not so much.
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with the caveat that it's difficult to assess your own reaction objectively.
I feel more in control of my vehicle when I've had alcohol, but objectively I know that's not the case.
That's hard to test because you might kill people or go to jail in the process, not because it's simply hard to test.
Also, concluding through controlled study that alcohol consumption impairs your ability to safely control an automobile is much easier than concluding that caffeine intake impairs creativity.
Creativity for one thing can be highly influenced by inspiration. Driving ability not so much.