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The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression". [79] [80] Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible. [79] The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game. [81] Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males. [82] [83] [84] [85] [86]

Answer: There are different levels of testing, Hellman says. "We are not being told, yet, what was done." First, there is the basic urine test . "This can be skewed by contaminants and cannot separate natural testosterone from synthetic," Hellman says. Second, there are radioimmunoassays. These are more accurate, because samples are purified, but they still cannot separate natural from synthetic. The third level, carbon isotope ratio mass spectrometry, can tell if synthetic testosterone is present. "Since most people don't live on yams and soy, this can pick out the difference between natural and synthetic," Hellman says.

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