Quote:
They're just activities to make you balance or use certain cognitive skills that are impaired when you're drunk, so that you'll show it more readily by swaying or slurring your speech
The impression that I got was that although the authorities make out they are physical tests, they are actually intended as social/physcological tests. If you say things like "I can't walk in a straight line toe to heel when I'm sober" or even just your interaction with the official when they ask you to perform the test - is what they are looking for, rather than your ability to complete the test. It is quite hard to guage how drunk someone is until they open their mouth.
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