The Cheapest Way to Test Drunkenness

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According to an article I read, giving drunk drivers tongue twisters is the least expensive way to evaluate them. Since police officers do not need to use their gadgets, I am in support of this. They can simply warn inebriated drivers not to operate a vehicle in this manner. In addition to that, it can stop auto or traffic accidents from happening on the road. What are your thoughts on determining someone's level of intoxication by using tongue twisters? In your neighborhood, how frequently do police install checkpoints with breath-testers? Image Credit: assets.iflscience.com