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To accurately determine a person's blood alcohol concentration (BAC), knowing their weight is essential because it influences how alcohol is absorbed and metabolized in the body. Generally, a heavier individual will have a higher volume of blood and fluids, which can dilute the alcohol consumed, leading to a lower BAC compared to a lighter individual who has consumed the same amount of alcohol. Therefore, weight is a crucial factor in calculating BAC, as it helps to estimate the degree of impairment and overall effects of alcohol on the individual.

While knowing the number of drinks consumed and the types of beverages can provide additional context, these factors alone do not give a complete picture of BAC without factoring in the person's weight. Additionally, the duration of drinking can affect the absorption rate, but again, without the individual's weight, one cannot make an accurate BAC assessment. Understanding these dynamics is key to effectively measuring and interpreting BAC levels.