However, too many people have the same rheusus blood group for this method to be effective. For example, in Taiwan the most common blood type is O, possessed by 42 % of the population--meaning more than one out of every three people--making it a poor tool for making the necessary distinctions.
然而，A、B、O、AB 等 4 種血型的重複性太高，例如在台灣比例最高的 O 型，佔總人口的 42％，平均不到 3 人就有 1 個，辨別度太低。