Drinking caffeinated alcoholic beverages can be dangerous for several reasons, including:
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Makes the person feel more alert - Caffeine is a stimulant, which can counteract some of the depressant effects of alcohol. This can lead individuals to feel more awake and alert than they actually are.
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Masks the effects of alcohol and a person may drink more - Because caffeine can mask the feelings of intoxication, individuals may underestimate their level of impairment and consume more alcohol, leading to a higher risk of alcohol poisoning and risky behaviors.
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The caffeine will lower the BAC, yet the alcohol concentration is still high - This statement is somewhat misleading. Caffeine does not lower blood alcohol concentration (BAC), but it can make a person feel less impaired than they actually are. Hence, it can lead to increased consumption and higher intoxication levels.
The statement regarding not meeting legal standards for a safe food additive may pertain to regulatory concerns, but it is less directly related to the immediate dangers of combining caffeine and alcohol.
Therefore, the most relevant concerns are the first, third, and fourth options you provided.