Driving with bean curd will not detect drunk driving after a period of time, only after eating bean curd. The ingredients of sufu food contain "edible alcohol", and the alcohol content will remain in the mouth after eating sufu. Therefore, the alcohol content will be detected by blowing immediately after eating sufu. However, the "power" of the alcohol content of sufu is only a few minutes.

According to the experimental test, after eating a piece of tofu milk, the alcohol content is as high as 292.5mg/ 100ml, far exceeding the standard of 80mg/ 100ml for drunk driving. Two minutes later, after drinking a glass of water, the alcohol content was11.9 mg/100 ml. After 4 minutes, the alcohol content was 0.

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In addition to tofu milk, eating litchi will also detect drunk driving. Litchi is the best fruit, rich in sugar, protein, etc. After enzymolysis, that is, anaerobic respiration, alcohol and carbon dioxide will be produced. Therefore, litchi can be used to make wine.

Litchi, grapes and other sugary fruits may be hydrolyzed to produce alcohol if they are left for a long time. This is also the case that the alcohol content is higher than the drunk driving standard after eating lychee. However, these foods only need to be tested in a few minutes, so there is no problem of drunk driving.

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